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Printrbot Talk Forum • View topic - Simple X Bed Depth Increase

Simple X Bed Depth Increase

Talk about modifications to the printer

Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-07-Apr

It looks like this topic has gained some traction, so I started a new thread for the discussion / development of the X bed depth. This is a continuation of a discussion started on the "Simple-300mm Y axis, No sag!" thread. Here is a link to the beginning of the X bed discussion:

viewtopic.php?f=21&t=6306#p44095
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-07-Apr

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Re: Simple X Bed Depth Increase

Postby thawkins » 2014-Apr-Wed-07-Apr

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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Wed-08-Apr

I did think about moving the X motor out and place it directly under the bed. Some Z height will be sacrificed for sure, but it might be for the best. Also, it'll give us all another reason to tackle the Z axis. I love how one mod seems to always lead to another.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-08-Apr

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Re: Simple X Bed Depth Increase

Postby thawkins » 2014-Apr-Wed-09-Apr

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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Wed-09-Apr

I say we should leave the X motor where it is and see how the bed performs before moving it. Ideally it should be centered, but it might just work where it is.
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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Wed-10-Apr

I agree with evanalmighty. yes putting torque on the one side of the bed may cause some lag on the far side leading to jams. but we don't know how far out that is. it could be 3 inches or it could be 12 inches. experimentation is needed

And really if you wanted to move the x motor to the middle of the table your moving out past the wooden frame by a far bit. so you simply raise the whole rig up the height of the motor and rotate the belt ends to the middle of the end caps and extend them downwards, much like regular belt mounts but on the bottom.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-12-Apr

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Re: Simple X Bed Depth Increase

Postby ahaer » 2014-Apr-Wed-14-Apr

You don't have to move the motor in order to get the gear under the center of the bed. What you could do is use the stock x motor mount to hold the motor. Make a version of Jon'x 608 bearing plate that replaces the short piece at the front of the printer and holds 2 608 bearings and another 5mm bearing (605??). the 608 would in the normal location left and right of the GT2 gear and a new bearing behind the gear to support a 5mm shaft that has the GT2 gear on one end and a coupler to the motor on the other. (ie GT2 gear, 605 bearing through back of place, ~75mm of shaft, then coupler to motor) This would probably requiring lifing the bed a little bit so it would go over the bearing and belt - I'm guessing around 5-10mm..

Sorry I don't have a quick way to sketch it out right now...
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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Wed-14-Apr

Anyway you could push it out to fit a 8" bed? I have a 8x8 heatbed and i've ordered a plate for it but i want to use something like this to support it?
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-14-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-15-Apr

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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Wed-15-Apr

i'm not talking about 8 in the x, i'm talking about 8 in the y. i am using you thing:257841 with a xl bed, giving me 10.5 inches of x travel. i would like, if at all possible for a modded file of thing:257841. so that it will fit a bed 8x8 inches, with the mounting points for the bed at 8.5 inches. giving me a print about 9ish inches long leaving me 1.5 inches of playing room.

I plan on finding the limit of the simple in terms of size and then figuring a way to make it bigger.
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Wed-16-Apr

It amazes me how quickly this community can come up with a solution to a problem that they come across. Imagine how much the Simple can improve in just one month or even in a year.
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Re: Simple X Bed Depth Increase

Postby dmaxx67 » 2014-Apr-Wed-18-Apr

HA! I just got done with building the x upgrade from ol' jon. You guys are simply one of the best communities I have ever been apart of. This is awesome. Once i get my ramps, x upgrade, y axis no sag upgrade installed and fine tuned again. I will be starting all over again with this! This is awesome.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-19-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-19-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Wed-20-Apr

I am confused, what would be accomplished by driving the bed from both sides? Don't get me wrong, I love the idea, I just need clarification.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-20-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Wed-20-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Wed-20-Apr

what happens if the bed was pulled between the two sets of bearings? I don't think there would be a tendency to pull to one side because the belt would be pulled between the bearings
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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Wed-22-Apr

I want to do the same as EddB but bring out to fit a 8x8 inch bed.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Thu-10-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Thu-14-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Thu-15-Apr

One point not addressed yet is how to "Dial it in." I know my X and Y axis are not perfectly perpendicular. If I print a 80 x 80 square and measure the diagonals (before removing from the print bed) they are off about 1-2mm. I should take the time to shim under the Z bearings to bring it in, but that is a real a pain. Print part, take axis apart, install shim, re-install axis, print part, take axis apart...

The bigger the print, the more noticeable the error will be.

Can anybody think of any better way to add some some method to adjust the X axis with respect to the Y?
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Thu-16-Apr

I am confused, don't we adjust the print bed to account for this?
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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Fri-01-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Fri-08-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-09-Apr

You should try printing a test part with the x and y extended out as far as possible. My idea is that we are going to have to slow down printing at those distances because of deflection. If the part comes out at slow speed but is skewed when printed at high speed, we will have are answer.
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-09-Apr

You should try printing a test part with the x and y extended out as far as possible. My idea is that we are going to have to slow down printing at those distances because of deflection. If the part comes out at slow speed but is skewed when printed at high speed, we will have are answer.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Fri-10-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Fri-10-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-11-Apr

Jon, your description was very insightful. When I was in high school, I did a great deal of milling on the Bridgeport. I remember doing tramming, which is a process of squaring the head of the milling machine to the table. But we were assuming that the x y and z axis are all square, which is what we cannot do in are case. I am going to see if I can come up with some kind of tool to help us because it is going to be a pain if we have to adjust everything with trial and error.
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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Fri-11-Apr

do you have a very low jerk setting then? the forces of acceleration on the y arm would cause some torque forces for sure. as well as stretching of the belts. but i believe you print very slowly due to you ability to check the printer?

we just need a way to mount a dial indicator to the head of the simple. with that and a block that could be repeatedly mounted in the perpendicular to the x edge of the bed, you could use the edge of the bed and just travel the x to check if the bearings on there are square, then mount the block and run it back and forth to check it's square. and the z is as simple as the y. you almost what to have a T shape that has a lip on one side that can hook onto the bed
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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Fri-11-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-12-Apr

The setup I imagine would work the best is using a dial gauge and a 1-2-3 block.
Image

Image

The idea would be to clamp the dial somewhere near the hotend. You would would place the 1-2-3 block on the platform and move an axis. Assuming everything is set up right, we should be able to see how much each axis is off. We are going to have to find a creative way to mount the block to the platform to allow for repeatability but I think somebody will come up with a smart idea.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Fri-12-Apr

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Re: Simple X Bed Depth Increase

Postby Some Printr Noob » 2014-Apr-Fri-13-Apr

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Re: Simple X Bed Depth Increase

Postby redwood » 2014-Apr-Fri-19-Apr

What about having a set of tracks or channels for the X axis to glide back and forth? This should take care of any sag concerns with a large span.

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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Fri-20-Apr

Those tracks are nice, but not the price. Anyhow I think I'm ready to go.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Fri-20-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-20-Apr

I know a great deal of you are going to moan but what about drawer slides? A great number of people use them when they make homemade cnc machines.
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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Fri-21-Apr

I have thought about salvaging the slider mechanism in old inkjet printers. I could splurge on a nice setup from McMaster Carr, but it takes the fun out of trying to make due with printed parts.
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-21-Apr

I totally agree that having everything 3d printed is a fun challenge but is it possible? Even if everything is made from plastic, will it last over years of use? These are the questions I tend to ask myself because I want to push the limits of everything. It is like I have this compulsive urge to redesign everything.
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Re: Simple X Bed Depth Increase

Postby redwood » 2014-Apr-Fri-22-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-22-Apr

I would totally try it if bearing will fit inside of it
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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Fri-22-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Fri-23-Apr

Edited @1am: first print. Not the final tweaks. 230mm x 250mm printrbot simple bed trial: https://youtu.be/jknl5ULOzJw
And here is how it turned out. Just a small part without calibrating except for z height. Wish all my prints turned out this well.!
1397290394687.jpg
Going to bed!


Original message : About ready to start testing mine. Finally got it assembled and the bed frame worked better than I could imagine. Friction fit and it's tight as heck but I am still going to add screw holes to secure the aluminum railing in case it loosens in use.
I have a few minor tweaks I already need to update in the design, but wanted to show where it's at right now. The major thing I am hoping works is the bed frame. Not only do I want to use the full length of Jon's extended Y, but I want to be able to swap out bed top materials using just standard binder clips. The main one being the 9.5"x12.6" inch 3mm thick borosilicate glass.
One thing I didn't consider is I may have to extend some wires to allow the Y to extend without stressing them to their limits.
It would be nice if it works without problems, but we know that isn't going to happen! :D here's the pic: (ignore the clutter!)
Ed
1397276457876.jpg
1397276608869.jpg
1397276690936.jpg
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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Sat-10-Apr

Jon Lawrence can you stretch out the bearing support in your design to fit 6 11/16" on center rods?
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Re: Simple X Bed Depth Increase

Postby kungfuroy » 2014-Apr-Sun-23-Apr

great x projects.

I would suggest widening the base of the extension(legs) to help keeping the printer from tipping over.

Most have seen my monster x frame, driving the movement just on one side has not caused me any issues. I did separate the bearings on the outer rod further to counter the torquing issue.

I still print slow, that is a good amount of weight jumping back and forth.... but slow is worth the nice quality the prints have.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Mon-08-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Mon-08-Apr

So here is a 170mm Rod center version. This one has a rod clamp built in using M3x16mm screws and nuts to clamp the rod and not allow it to twist. Just drew it up this morning, so I have not tested anything yet.

RodEndClamp_170mm.STL
RodEndClamp_170mm-Mirror.STL
BearingExtension170mm.STL
ExtendXExpandBearingsRodClamp2014-04-14.JPG
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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Mon-09-Apr

Here's my result with the mod. I printed out the very first one which is 125mm spacing between rods. The bolt holes didn't quite line up, but I pressed ahead with the zip ties anyway.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Mon-10-Apr

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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Mon-10-Apr

Hi Jon this is 2014 simple. I didn't measure, but they look to be about 2-3mm off?
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Mon-11-Apr

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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Mon-13-Apr

the 170 will do just fine. but i have the same holes as Evan. they are offset backwards from the ziptie hole about .130" or 1.404" center of hole, back from the front end of the plate.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Mon-14-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Mon-22-Apr

Glad it's not just me! Been pulling hair trying to get stuff to fit. I built using my 2013 for the mockup, everything fits perfect. but when I tried moving to the 2014. seems there is a little shift in most areas. Almost like they redrew the base. On top of that, my hotend started dripping burnt filament. replaced the teflon twice on the nozzle. the leak is in the aluminum heat block or above. a real mess under the insulation sleeve that is pla/super glued to the hotend when cool. hoping to get a replacement before it gets too bad!
My new bed setup works perfect...for me....trouble is making sure others can use it!
Well, back to it....
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Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Tue-00-Apr

I was thinking that you could consider lifting the whole bot up to make room for the stock motor. I have mine lifted with the feet I modified: thing:299548 I don't have a way to modify the drawing of the bearing extension to show you what I mean so I made a really really ugly crude sketch

motor mount on legs.jpg
IMG_7170_preview_featured.jpgIMG_7171_preview_featured.jpgIMG_7173_preview_featured.jpg
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Wed-22-Apr

I managed to crudely sketchup one idea... at the front is a mount for the raised legs I made... and at the back I put some extra holes so that the connection between the bot and the extension could be strengthened since it will be raised. Then I just tossed in the belt motor mount .. just to show what it would look like... I am not expert so I am hoping someone that knows how to model will "fix" this...

what do you think?

motor mount on legs2.jpg
Xincreasewith legs.skp
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Thu-09-Apr

Looks like an excellent method of communication. Picture = 1,000 words and all.
My preference is to not run timing belts on their side. Gravity pulls the belt down to the flange and on long spans out of alignment.
That being said, these motors are basically square, so there is no reason with a raised machine, the motor cannot be mounted horizontally. Simply move the motor down and keep the bearings up just under the print platform.
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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Thu-15-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Thu-15-Apr

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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Thu-20-Apr

i dun goofed. I ordered a cast alum bed for a PB+. i thought that it would be a thin-ish bit of cast alum. instead i got a 1/4 monster of cast alum with a milled out area for the heat bed and alternative mounting holes.

So i ask again that you modify your design to fit bed mounting holes 9 inches apart. this mite be pushing the weight you can move with belts. the bed is very heavy, but we must try, FOR SCIENCE
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Fri-00-Apr

I am thinking of ordering from these guys... I am in Fairbanks AK..so I dont have much to choose from.. for the bed Well I was going to post a link .. how can I upgrade my status to be able to post links? the site is cut2sizemetals they will custom cut a sheet of aluminum the right size.. I print cold right on metal .. after coating the surface with purple elmers glue stick.. No curling at all. I also do this on cold glass.. sometimes if the part does not have too much surface area I will do blue tape on metal or glass and then coat the tape.. never used heat.. but I accidentally purchased a role of ABS so I am getting a plate and modding a PS so that I can heat this new giant bed we are building. With the aluminum I am thinking that the bed mounted under the heater will radiate the heat to the larger size... it is an 8x8 bed.

??
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Fri-00-Apr

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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Fri-03-Apr

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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Fri-08-Apr

How big of a piece of aluminum do you need Dan? I have plenty
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Sun-01-Apr

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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Sun-01-Apr

You know; I was thinking that it might be cool if we set up a time and did like a Google Hangout for an hour or so some time so we can all talk 3D printers and share findings and such? Anyone interested??
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Sun-02-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Sun-02-Apr

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Printrbot Simple 1405 with XL bed and
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Printrbot XL volume / tower upgrade GT2 X Timing Belts (thing:194686) GT2 Y Timing Belt Mod (thing:194586)
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Sun-05-Apr

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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Sun-07-Apr

I'll see if I can cut a piece this week Dan. Most likely it's be .125 thick if that's OK.
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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Sun-11-Apr

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Complete printable 1405 Simple https://www.youmagine.com/designs/compl ... s-edition/ or thing:425164

True Wireless Slicing and Printer Cloud+Web Server w/ AstroPrint PcDuino v2

Printrbot Simple 1405 with XL bed and
Printrbot Simple 1311 Printing ABS andPLA on kapton/borosilicate glass
Printrbot XL volume / tower upgrade GT2 X Timing Belts (thing:194686) GT2 Y Timing Belt Mod (thing:194586)
Custom 320 x 230mm aluminum bed frame w/ 3 x 8mm rods
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Sun-11-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Mon-21-Apr

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Complete printable 1405 Simple https://www.youmagine.com/designs/compl ... s-edition/ or thing:425164

True Wireless Slicing and Printer Cloud+Web Server w/ AstroPrint PcDuino v2

Printrbot Simple 1405 with XL bed and
Printrbot Simple 1311 Printing ABS andPLA on kapton/borosilicate glass
Printrbot XL volume / tower upgrade GT2 X Timing Belts (thing:194686) GT2 Y Timing Belt Mod (thing:194586)
Custom 320 x 230mm aluminum bed frame w/ 3 x 8mm rods
430 watt ATX power upgrade for 8.5" heat bed via SSR
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Tue-14-Apr

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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Tue-19-Apr

So i'm trying to print out a one side of my extension, but Slic3r doesn't like my model and cura is a POS. I've run my model though netfabb and when i export it, it says its fine but slic3r won't generate most of it and the deep analyses on rep host is highlighting most of the bottom of the model but the i don't know what's broken when i pull it up in netfabb. if someone could take a look at the file and find something i missed i'd be greatful

9inchext (repaired) (repaired) (repaired).stl
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Tue-20-Apr

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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Tue-20-Apr

I found the problem. instead of hand stitching the stretched parts i used a pull on my software and it didn't join the part nicely
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Tue-20-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Wed-02-Apr

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True Wireless Slicing and Printer Cloud+Web Server w/ AstroPrint PcDuino v2

Printrbot Simple 1405 with XL bed and
Printrbot Simple 1311 Printing ABS andPLA on kapton/borosilicate glass
Printrbot XL volume / tower upgrade GT2 X Timing Belts (thing:194686) GT2 Y Timing Belt Mod (thing:194586)
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Thu-00-Apr

Just an observation... we seem to have lost quite a bit of buildable area on the x axis with the change from the first model x axis upgrade to the deeper one.. Any way we can get that back? I think it is from mounting the bearing rods further in?
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Thu-02-Apr

I just noticed that you how you have the string attached for stability EddB. I am not having an issue with that . I am using the version of the end plates that used the screws to tighten the rods.. they work really great.. there is no twist or loosening at all going on. I really hope JON keeps that in all future versions..
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Thu-11-Apr

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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Thu-11-Apr

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Re: Simple X Bed Depth Increase

Postby EddB » 2014-Apr-Thu-16-Apr

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Complete printable 1405 Simple https://www.youmagine.com/designs/compl ... s-edition/ or thing:425164

True Wireless Slicing and Printer Cloud+Web Server w/ AstroPrint PcDuino v2

Printrbot Simple 1405 with XL bed and
Printrbot Simple 1311 Printing ABS andPLA on kapton/borosilicate glass
Printrbot XL volume / tower upgrade GT2 X Timing Belts (thing:194686) GT2 Y Timing Belt Mod (thing:194586)
Custom 320 x 230mm aluminum bed frame w/ 3 x 8mm rods
430 watt ATX power upgrade for 8.5" heat bed via SSR
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Fri-20-Apr

When I posted about the lost print area.. I mostly was not thinking LOL. .. once I pulled the paper off my plexiglass and "re-realized" that the bearing were seperated on the upgrade.... DUH.. out of sight out of mind. I just compared my last build platform and starting scratching my head. JON I just printed your latest X extension with the rod inserts.. it looks beautiful, I love your design work .. Like I said before I would love to learn this stuff.. ... I had modded your last one with extensions for my lift; I have to say I really like my bot lifted... but it created some real sag and wobble between the bot and the addon. I had to brace it in the middle and still adjust the leveling screw way higher in the black to level the build surface. Now I am going to try this without my lift just on the table with the rods added. Although I think the added rods would help add that stiffness to my added lift. I will probably add the feet back ... they do seem to reduce some vibration but .. in this case they are making it worse. Also I am getting most of my vibration now from the Z axis rods. With the XL upgrade I was able to clamp the highrise to my desk and secure it pretty well.. and this has me thinking about adding some sort of extra stabilization to the z axis rods. If it is bad for us with the XL holding them at the top I can only imagine that it is impacting those without it all the more.

On another note... if anyone is interested in doing a Google hangout I would like to get a list of times that would make sense.. I may end up just hosting one while I am fiddling around just to see if anyone randomly joins....???
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Re: Simple X Bed Depth Increase

Postby danman78 » 2014-Apr-Sun-16-Apr

Video of my printer in action....

http://youtu.be/GWs9fT35Zt4
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Re: Simple X Bed Depth Increase

Postby evanalmighty » 2014-Apr-Sun-17-Apr

Don't forget to pm me your address for that aluminum plate Dan.
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Tue-22-Apr



Image
Image
Image

I thought this was an interesting GT2 belt drive for the X-axis. Jon, how does this compare to your "Double Precision MXL X-Axis, Printrbot Simple V2" mod? It seems weird to me that somebody would redesign the entire thing
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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Wed-09-Apr

i don't really understand the use for the extra bearings. Anyone know if that would be useful?
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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Wed-12-Apr


Image
Image

If you look at the image above, you will notice 2 bearings on the ends and 2 bearings by the pulley. This mod seems to work very well, I was hoping to get some feedback from Jon. It might be a good idea to incorporate this mod with Jon's "Printrbot Simple X upgrade" mod.
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Re: Simple X Bed Depth Increase

Postby Jon Lawrence » 2014-Apr-Wed-13-Apr

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Re: Simple X Bed Depth Increase

Postby greenb » 2014-Apr-Wed-14-Apr

I noticed that Marlin firmware is every close to the RepRap Teacup firmware, however, the Teacup firmware performs much better. They both have a MAX_STEP_RATE config of 40,000 steps per second but this is cut down in the Marlin firmware to 10,000 steps per second by interrupting 1, 2 or 4 theoretical steps between each actual step. I also noticed that the accel_clock was causing the interrupt because the firmware is calculating the acceleration after each step. Some people on the forum below noticed that the acceleration measurement at a 500 step interval was just as accurate as the single step interval. This is how the Teacup firmware is able to have a much higher step rate. I am trying to see if I can use this change in the Teacup firmware and apply it to the Marlin firmware.


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Re: Simple X Bed Depth Increase

Postby killbox » 2014-Apr-Wed-17-Apr

ok, so i've been fighting with my design long enough, if some could please make a extension that can fit the Printrbot+ alum bed with the cables running out the printrborad side i would be very grateful. not matter what i do things just don't fit/line up and i'm tired of fighting with it. i'm sure you can find a model of the plus online but my measurements of the holes for the mounting hardware for the bed are 7 1/8" x 8 7/8". if anyone could help me out i would be grateful
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Re: Simple X Bed Depth Increase

Postby zero10 » 2014-May-Thu-08-May

This has been a very interesting thread, thanks so much for all of the ideas and contributions here!

I am trying to fit a 6"x12" aluminum bed that I made to my 2013 direct drive wooden extruder printrbot simple. I drilled the bed for the stock mounting hole spacing (approximately 103.5mm on center) and had planned on using the first iteration of Jon's X axis extension but the idea of increasing rod and bearing spacing really appeals to me. Unfortunately I'm getting a little bit lost in how these new parts are specified and which parts I really need, mostly I'm confused by the rod spacing and what end brackets are required, as well as what the maximum bed width is for each.

Are there any parts in this thread that can be used with a 6"x12" bed? I can drill some extra mounting holes on my bed if necessary, and I really like the idea of printing a plate to bring the bearings out in front of the printer. I have already done Jon's Y axis extension (although it is the older one without the screws to stop the rods from twisting) so I have around 155mm of Y depth available to me for printing, and I have 2 pieces of 8mm rod about 700mm in length available (should be plenty left to cut down for my 12" desired X travel)
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