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Printrbot Talk Forum • View topic - Jon Lawerence's X & Y GT2 belt mod

Jon Lawerence's X & Y GT2 belt mod

Re: Jon Lawerence's X & Y GT2 belt mod

Postby Jon Lawrence » 2014-Mar-Mon-19-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Mon-20-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Mon-21-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby EddB » 2014-Mar-Tue-00-Mar

This item looks like it would be really secure. I've had my own problems with the belts slipping. Might try a couple of these on the open end right after the tensioners, if it slips again. I'de use the as end clamps along with jons tensioners.

http://www.thingiverse.com/make:38668
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Tue-01-Mar

The larger piece works like a charm. Thanks, Jon!

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Mar-Tue-18-Mar

Alright took Jon advice and built first rendition of x axis belt mod. Only thing left is bearing caps for x mod. Gonna start on y tom night. Also had my printer hang on a few prints and caught one before it did I believe and heard my y motor crunching. Turned motor voltage down slowly and crunching went away. Did the same for my x motor even though it wasn't crunching. Its pot was sitting at the same position as my y axis.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Jon Lawrence » 2014-Mar-Tue-19-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby EddB » 2014-Mar-Tue-22-Mar

Thank you for the wedges! I have loved every part of your design, but this just makes it even more solid!
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby evanalmighty » 2014-Mar-Wed-16-Mar

Gotta give it to you Jon. Great designs.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Wed-18-Mar

Just did a 9 hour print. Everything works so nicely that I really don't want to touch anything else anymore. But of course, I will continue looking for improvement if given time. I'm pretty sure the fishing line drives wouldn't have been able to do this all that well.

Current Printer setup:
http://i.imgur.com/fF6egkv.jpg

Print:
http://i.imgur.com/QOPHMuQ.jpg
http://i.imgur.com/tiNSZHv.jpg
http://i.imgur.com/8xldgAh.jpg

Source:
http://www.thingiverse.com/thing:10485
Scaled it so I could use as much of the Printrbot Simple's stock printing space.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Thu-22-Mar

I had a question about the structural aspect of the "bed carriage" which I was hoping someone might be able to answer: As it's connected to the bed itself in a rather stable manner, as long as the bed carriage is reasonable stable transferring X motion to bed, that's all that matters right?

I mentioned before my bed carriage was rubbing against the X-axis motor drive shaft once I rotated it 180deg as mod expects. I've used a Dremel to cut away about 1/4" of the wooden "bar" of the bed carriage closest to the X-axis motor in order to stop it from rubbing against the shaft. While I tried to minimize the cut-away, it about halved the width of that top "bar", and I'm just making sure that's not a problem.

I seem to actually recall seeing someone else's mod where they just removed that bar almost entirely (except at the ends where the bed and printed belt mounts attach), and they seemed to work. Overall, I'm not too worried, but figured I'd ask just to see if anyone encountered any problems after modifying the bed carriage in any significant manner? It doesn't seem to be much structural support (the bed has plenty of that by itself, it seems), but is what little it does offer important beyond simply translating X-axis motion to the bed?

Thanks!!
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby EddB » 2014-Mar-Fri-00-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Fri-02-Mar

Hmm, I've already modified the bed carriage so I'm not really that concerned about the carriage impinging on the motor drive shaft anymore.

When others said doing the X-axis mod was involved, I didn't quite grasp just how involved they meant. Because the bottom two motor screws are actually "trapped" in the wood that's the bottom piece for the entire base assembly, I'm quickly realizing that to free the motor plate for replacement involves basically disassembling the entire base on the printer (I'll disconnect the Y-arm, take it off, and set it aside to avoid problems there). Still, I don't see how I can get at all four motor screws without removing the bottom piece of wood, and doing that appears to require removing both side pieces as well.

Kinda makes me wish I'd bought the kit, and just done the belt mods as I put the thing together in the first place. I wonder how soon they'll have the metal Simple for sale? I'm almost tempted to buy a second printer to use while modding the Simple. Not quite to that level yet, but I know once complete I don't plan to do any further mods of this scale again -- if I need more than the Simple+XL can provide, I'll definitely buy a second printer.

Anyway, one more Saturday of solid effort ought to be enough to finish the disassembly/reassembly, I'm guessing. It'll be nice to have a working printer again.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby EddB » 2014-Mar-Fri-11-Mar

That's true, I forgot aboit the bottom base plate entirely. Do both your z, e and x motors have the same length of shaft? Yours is the only one I have seen with this issue. I am wondering if you got a different motor (longer shaft needed for the new printer designs?) or maybe you got a base plate or bed mount from a beta simple?
If we could figure out if it's the motor, that would be a lot cheaper/easier to replace than purchasing new wood.
If you can, when putting it together, post some pics and see if anyone can figure out what is different about yours.
I know what a pain it is to have to remove the x motor mounting plate several times! Mine kept loosing the belt off the right bearing. Tracked it down to the right bearing sitting at an angle and have taken kt apart 3 times before I printed a new motor mount and just replaced it.! Better to get everything working smoothly the first time around.
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Sun-05-Mar

So I've finally printed out the parts for your new X mod, and plan to move the current Z rods to the X.
http://www.thingiverse.com/thing:257841

I've also picked up a 6c6 heated bed and thermistor. I was wondering how you wired up your thermistor.

Also, can you print right on top of the heated bed, or do you need a sheet of aluminum or glass? I don't want to go through the hassle of finding a 6x6 piece of glass as I don't know any companies near me that cut glass.

I also printed the 300mm no sag Y parts. I'm currently waiting on some new rods, a power supply, heated bed & thermistor, and some longer belt.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Mar-Sun-10-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Mar-Sun-10-Mar

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Jonbot+
225mm x 200mm - Heated Bed
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RAMPS 1.4 running Marlin 0.98
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby pantseatflyer » 2014-Mar-Mon-10-Mar

Does the bed seem to help with curling? My Simple XL aluminum bed sucks big time with curling because it's so stinking cold.
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby pantseatflyer » 2014-Mar-Mon-12-Mar

Been there done that! For small prints it works great. For big stuff, it curls without fail. The room that's printer resides in is not all that well insulated. The ambient temp is about 65. That bed gets very cold to touch. It will hear up quick with the hair dryer but cools off quick as well.

Gonna run to harbor freight today to pick up a machinists dial and print out the part to help level the bed. This and a heated bed would be ideal.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Mon-15-Mar

Speaking of heated beds, I picked up the 4.5x6 heated bed kit from MakerFarm (IIRC) as well as a thermistor, and while I'm putting the printer back together have debated doing that mod as well. What I'm not sure about is that the bed heater is significantly smaller (in X) than the alum. XL bed, is that okay? Or should it nearly match the bed's X dimension except for leveling screw hole clearance? If it's okay as is, then as I understand it, the "bed sandwich" should be: insulator, spacer and/or thermistor, alum bed -- is that correct?

I too get significant curl at the edges (f.e. of the X-axis motor plate, need to actually print another in fact) due to my alum. bed as well, so even a bit of moderate heating at the center seems like it'll help with most prints. What temperatures do folks set their beds at when working with PLA?
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Jon Lawrence » 2014-Mar-Mon-15-Mar

My position would be, anything is better than nothing. If your heat distribution is not exactly even, it is still better than none at all. Aluminum is an excellent heat conductor, so it will even out the heat pretty well. Here is a picture of my sandwich.
Bed / cardboard / thermister (not shown) / heat plate / glass.

What is the worst case? You simply don't turn it on...

XUpgrade(6).JPG
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby pantseatflyer » 2014-Mar-Mon-16-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Tue-14-Mar

Just wondering, for those of you with heated beds (esp. Jon), what temp do you set it at for PLA work?
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Jon Lawrence » 2014-Mar-Tue-15-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby evanalmighty » 2014-Mar-Tue-16-Mar

I would also guess 50-60C territory. I don't even think you need to have it on the entire time. Once you've built up enough mass I think you can trickle it down.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Mar-Tue-17-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby stupendousman » 2014-Mar-Tue-19-Mar

After reading all these threads and seeing these upgrades, I want to vote for Jon Lawerence for Printrbot President. MUCH appreciated.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Mar-Tue-20-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby evanalmighty » 2014-Mar-Tue-22-Mar

I'll wire up my heated bed right after I do the 300M Y extension mod. I think you might have convinced me to give ABS another try.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Wed-17-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby evanalmighty » 2014-Mar-Wed-17-Mar

I run the heated bed off of an old 110v variac.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Wed-17-Mar

Ah well, it wasn't much of a joke anyway.

Back to GT2 mods, everyone seems to have their own favorite "belt tensioner" thing. I'm leaning towards the traditional tension block (from Jon's mods) along with a wedge (from this thread). Who all else is using such a configuration, and what (if any) positives and negatives have you found that might be interesting?

Thanks!
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Dabhaidh » 2014-Mar-Thu-22-Mar

In your Printrbot Simple X upgrade thing:257841there is a green part on your simple. It seems to be a fan housing. Would you let us know where to get a stl file for this.

Thank you
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Fri-01-Mar

Semi-cross post from Jon's other X & Y thread. This is about both the Y and X Upgrade

Started installing these mods. I kind of wish I waited to use my black PLA to print the parts, but the amber/orange doesn't look that bad.

Image

Image

So far everything on the Y axis has fit nicely. I had to print the Y/Z block twice, since Slic3r messed up on two of the bearing slots. I'm probably going to be using Cura to slice from now on. The zipties I have are a lot softer than the one that came with the Printrbot. This results in some slight play if some force is pushed on the rod, but overall it's a lot more rigid. I guess this will help when I accidentally run the Ubis into the bed.

Still using the stock acme rod. I haven't found a good place to find a two foot long rod. I did find a 3 foot long one on mcmaster, though. Unfortunately one of my Y rods isn't made all that well, and has a lot of resistance with the bearings. It's a tad too big and uneven. Gonna try and get it replaced.

I would like to do the cable management as well, but I have a spool holder in that area. I was wondering if you could possibly put the cable management and spool holder together somehow? That would be the best of both worlds.
Spool holder:
http://www.thingiverse.com/thing:118559

The X was relatively smooth so far as well. I did have some problems where I collided with the motor shaft before the bearings:
Right side:
Image
4mm lost

Left side:
Image
3.33mm lost

Probably varies from motor to motor. I'll probably just have at the printed parts with my dremmel again.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Mar-Fri-08-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Mar-Fri-08-Mar

Jon is there a way to make your x axis carriage rod mounts go though the entire piece instead of with the endstop. Thinking maybe this way if someone wants to keep rods a little longer but used stock bed or just play with bed sizes they would not have to re-cut different rods but just cut tie straps and move pieces further out and re-tension belts.
Just a thought the design is awesome as is just been thinking about that and wanted to throw it at you.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Fri-10-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Mar-Fri-11-Mar

some printer noob where did you get the z axis coupling
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Jon Lawrence » 2014-Mar-Fri-11-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Jon Lawrence » 2014-Mar-Fri-11-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Mar-Fri-14-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Fri-15-Mar

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Mar-Fri-18-Mar

Appreciate the quick reply. Ordered.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby pvyParts » 2014-Mar-Mon-08-Mar

Printed the Y Belt mod and was working great! till i noticed a skip half way through a build xD

apparently my y motor was cooking! it warped the motor face plate. (fixed that with the current POT on the board)
Only reason i noticed was the bearings were on an angle.

DSC04540.JPG
DSC04539.JPG

something to keep an eye on for the new people like me.

I am going to print the X axis and the no sag Y as soon as i get some more filament ( accidentally ordered ABS and have no heatbed so goes to poo )

anyhow great work!
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Mar-Mon-11-Mar

Fiddle with the pot settings on the printrboard. Counter clockwise is less current, clockwise is more current. Less current = less heat. However, you need enough current so the motor doesnt skip.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby pvyParts » 2014-Mar-Mon-18-Mar

I did yeah, it only needed about 10 degrees to start skipping so very fine adjustments are needed i sorta ham fisted it the first time I set it.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Apr-Tue-10-Apr

Printer is singing with the orginbal gt2 mods right now. And i can print so much faster and still have the accuracy :mrgreen: :mrgreen:
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Apr-Tue-10-Apr

Shoudl i print the rev b version of the x axis upgrade if i dont have a 2014 simple?
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby sarahspins » 2014-Apr-Tue-11-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby ccbdav » 2014-Apr-Tue-20-Apr

I ordered two GT2 kits from Printrbot and some 608 ZZ bearings on amazon---does it matter if they are unshielded, single-shielded (Z), or double-shielded (ZZ)?

Thanks in advance for any replies.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Tue-21-Apr

Currently using these:
http://www.ebay.com/itm/608ZZ-Bearing-8 ... 1e88f2ddc6

They were cheap and the first thing that popped up. The only problem I've been having with the mod is that the belt doesn't always line up with the pulley or bearing. I think my X motor block is slightly warped from me forcing the motor into the slot, causing the bearing posts to point outwards and slant the bearings. For the 300mm Y mod, it seems a lot better as there is only one bearing. I plan to use a spacer on the bearing, though, as the belt doesn't want to fully align as well.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Apr-Tue-21-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby ccbdav » 2014-Apr-Wed-14-Apr

Thanks for the replies and the amazing work designing and documenting these mods. Can't wait to get my parts to get started on the upgrades!
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Apr-Thu-06-Apr

What speeds are ya running after gt2 mod on both x and y.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby spitfirehauser » 2014-Apr-Thu-13-Apr

WOW i started Jon Lawerences X axis upgrade http://www.thingiverse.com/thing:257841 last night and was amazed at how quickly and how painful the X axis stepper motor plate replacement went down hill. i almost have it back together but i would rather have a sharp stick in the eye instead of doing that again. in hind site i should have removed most of the cables from the printr board and remove he Y-Z carriage to make things more manageable. I read in both this forum and the thingiverse posts how hard the upgrade could be but just assumed it would be easy since it was not a huge challenge to build it in the first place. to get to the part you basically have to take it apart and then re-install everything. don't cheat like i tried to do and try to leave everything in place and expect to be easy. Just and FYI
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Apr-Thu-14-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Thu-14-Apr

I got a cheap bar clamp from hobbyking.com with my digital calipers. I can flip them out so they push objects apart. So much easier to seperate and assemble the base of the printrbot simple now.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Thu-22-Apr

The belt keeps wanting to slip off the bearings and pulley on the X axis. I'm about to pull my hair out trying to find out why. I also had to put a spacer behind the bearing on the 300mm no sag Y mod so that the bearing would actually line up with the belt. Going to continue tweaking by hair-drying the belt ends and figuring out a way to space the spacers.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Apr-Thu-23-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby spitfirehauser » 2014-Apr-Fri-09-Apr

IMG_0625.JPGIMG_0623.JPGI did get the rest of the printer back together and started working on calibration. I did have to grind the small amounts where the stepper motor U mounts but other then that my prints were good. see attached pictures, i will upload to thingiverse once i take pictures of the Simple with the print bed on. Thanks all this is now Extra Awesome. I guess i have to change my signature to something different them Stock simple.......
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Fri-15-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby dmaxx67 » 2014-Apr-Fri-19-Apr

Has anyone printed the x axis later gen bed supports After doing the 1st gen x and y axus belt mods. I have them both installed a stock simple and lack about 2mm of being able to print the bed carriages. Am I missing something completely obvious?
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby sarahspins » 2014-Apr-Fri-23-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Sat-02-Apr

Well, one side of the belt end rolls on the bearings just fine. I've rigged up my heated bed, and 60c seems alright(although it takes ages to heat up; going to assume that the thickness of the wire on the old PSU connector[picked up a 12V 18A Dell laptop brick] isn't enough to deliver the juice this little guy needs). I've recalibrated my printer, and am attempting to print replacement pieces as I had a little bit too much fun with the hair dryer and some parts of the belt ends warped. So far, the larger of the belt ends is halfway done with no problems. My 300MM no sag Y axis system has been working nicely, though.

1. The motor pulley may be out of alignment if they are not all the same thickness.
They are pretty close in thickness. I had to manually cut them as they were attached to metal washers, which didn't allow me to screw into the motor since there was so much spacing. Each one is about 1mm.
2. The motor may flex and pull itself out of alignment while printing if the washers are soft and "squishy."
I think they're made of neoprene. They are flexible, but not very squishy.

I'll re-print some parts that got warped, and then take pictures if I'm having the same problems again.
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby thawkins » 2014-Apr-Sun-01-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Apr-Sun-14-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Sun-15-Apr

Yeah, I've been using the wedges. They fit like a charm, except for the one on the 300MM y axis where the extruder area is. I have to mount the belt normally in that little slot.

So far the only fix I've found is to have a spacer to get the bearings out further. I split a paperclip in half and wedged it behind the bearings, to get an extra 1mm of spacing or so. Everything works relatively smoothly now, but I might try modifying the motor block with netfabb/meshlab to get an extra mm of spacing on the bearings.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby ccbdav » 2014-Apr-Mon-21-Apr

Finished the y-axis GT2 mod last weekend, and I couldn't be happier with the results! Excellent and relatively easy upgrade. Thank you, Jon and everyone else participating in this thread.

After finals I hope to do a tear-down and install the x-axis GT2 mod, but I have a quick question regarding the latest parts list, specifically for a Maker's 2014 (with XL upgrade if that's at all relevant). From what I can glean, one will need two (2) bearing caps, two (2) tension blocks, one (1) motor mount, and...what exactly? I have printed one XBeltEndGT2RevC.stl and one XBeltEndGT2Mirror.stl. Is this correct, or should I attempt to mirror the RevC part?

It looks like the original mirror will suffice as, from what I ascertain, it is only the right side end cap that was causing issue but I'd like to be sure before I begin the tear-down.

Thank you again.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Mon-21-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby ccbdav » 2014-Apr-Mon-22-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Some Printr Noob » 2014-Apr-Tue-02-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby ccbdav » 2014-Apr-Tue-17-Apr

Thank you both for the info.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Zyzic » 2014-Apr-Mon-09-Apr

Just assembled the Simple over the weekend (2014 version). Very excited about doing this GT2 mod. Thanks to everybody (especially Jon) who has contributed to this thread with fantastic info.

One thing I didn't see mentioned was where to source the non-printed parts from. Jon's design drawings for the X & Y upgrades give McMaster part numbers for the screws, but not for the bearings, pulleys, or belts. I saw a GT2 kit in Printrbot's store, but I was wondering if I could source all of these from McMaster.
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Zyzic » 2014-Apr-Mon-09-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Palerob » 2014-Apr-Mon-18-Apr

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-------------------------------------------------------------------------------------------------------------------
A Simple is not just a tool, it is an addiction. ;)
-------------------------------------------------------------------------------------------------------------------
2014 Simple W/ XL+Tower Upgrade
MODS: Jon's GT2 X and Y Belt mods, soon to have the Y extender and X Depth extender.

Also: 2014 Black Metal Simple (Technically the wife's but you know...)
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby ccbdav » 2014-Apr-Wed-23-Apr

What sort of rods are needed to make work on the XL bed?

EDIT: I have no access to solid metal cutting tools.
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Re: Jon Lawerence's X & Y GT2 belt mod

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

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby pvyParts » 2014-Apr-Fri-06-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby stupendousman » 2014-Apr-Sat-15-Apr

Wow. Is there a link someplace to download those side support legs? I've been looking for something EXACTLY like that!
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby evanalmighty » 2014-Apr-Sat-16-Apr

Those legs are part of this mod here: http://www.thingiverse.com/thing:215294
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby stupendousman » 2014-Apr-Sat-17-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby Munson » 2014-Apr-Sun-07-Apr

The supports in the back of the printr?
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby jwiede » 2014-Apr-Sun-13-Apr

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Re: Jon Lawerence's X & Y GT2 belt mod

Postby spitfirehauser » 2014-Apr-Tue-10-Apr

Yes, they work VERY well and work in the existing hole. I have no problems with stability and have now completed both your X and Y upgrade.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby ccbdav » 2014-May-Fri-20-May

Finally got around to installing the x-axis mod...wow!

Thanks again for this great modification.
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Re: Jon Lawerence's X & Y GT2 belt mod

Postby DainBramage » 2014-Dec-Fri-16-Dec

I know I'm a little late to this party, but I just finished this same/similar modification. I hadn't seen this post until after I completed it, so I did mine a little differently.

On my Y axis, I didn't have the physical room to fit 8x22x7 bearings on either side of the pulley I had and still fit a gt2 belt through, so I found 688hZZ bearings with dimensions of 8x16x5. I could have used a pair of them together to make a 10mm bearing surface, but 5mm works as long as you are careful in aligning the anchors.

I then used some similar wood (could have used the part I took out that the X motor mounts to but I couldn't find it) and glued it to the top of the lower X bed where the belt will anchor. I made sure that the thickness of the added wood would keep the belt perfectly level, compensating for the 18mm bearings. Then I cut the Groove longer and moved where the leveling bolts attach a bit forward and attached the I belt using small spring clamps so that I could print the new belt anchors and adjuster.

The main thing to remember is that whatever size bearings you use, the belt must remain perfectly level on either side of the pulleys so that the tension is consistent throughout the range of motion. (it's like pulling a car with a rope at an angle rather than straight. It wastes torque, reduces the size of your print near the ends, and introduces backlash in the center of your print area.

Thanks for this post and I hope my suggestions help others who may be getting ready to make this same upgrade to their printrbot. Definitely worth it. Much better precision with the GT2 implemented correctly!
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