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Printrbot Talk Forum • View topic - Extending the PBJR Z axis

Extending the PBJR Z axis

Talk about modifications to the printer

Extending the PBJR Z axis

Postby SilverFingers » 2013-Jul-Sat-00-Jul

Would it be as simple as buying longer rods and replacing them?

I think I'm going to head to Lowe's later this week and pick up some longer rods.

Should they be made out of a certain type of metal?
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Extending the PBJR Z axis

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Re: Extending the PBJR Z axis

Postby Bob-StPaul » 2013-Jul-Sat-00-Jul

Does Lowe's sell smooth rod? I don't recall seeing smooth rod at any hardware store...
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Jul-Sat-01-Jul

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Re: Extending the PBJR Z axis

Postby SilverFingers » 2013-Jul-Sat-08-Jul

Interesting. Let me know how it goes
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Re: Extending the PBJR Z axis

Postby SilverFingers » 2013-Jul-Sat-08-Jul

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Re: Extending the PBJR Z axis

Postby mrsamnc » 2013-Jul-Sun-18-Jul

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Re: Extending the PBJR Z axis

Postby gyronictonic » 2013-Jul-Sun-21-Jul

You can use 8mm drill rods too. It's not chrome plated but it's definitely cheaper. Since you are only replacing the Z, you don't have to worry about wear n' tear.

http://www.mcmaster.com/#88625K67
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Jul-Mon-00-Jul

Here's the status. I increased the z height by 3.5-inches. I installed a double nut system with compression spring (using Alaster's bracket: ) but found that there was too much tension throughout much of the travel for the stepper. It got a bit better after some lubricant, but still wouldn't move over the full range.

I've reverted to the original, single bolt configuration for now. I think I'll try a weaker spring.

It's mostly working now, after resolving an issue with a loose GT2 pully on the y-axis that strangely decided to show up after the first test print (I installed it a week or so ago and it was fine). I now have one remaining issue which is that I can't go above 130mm even though I set the print area height in the printer settings to be higher than that. I'm stratching my head over this one. It's not mechanical interference. Repetier just won't allow me to go higher (the z shows up as red if I try to manually go above 130mm).
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Jul-Mon-10-Jul

Okay, now I find that (after measuring the height) I'm only actually going to 100mm!

A quick search shows that Marlin has a parameter for travel limits. I wonder if it's set to 100mm on the printrbot version of the firmware.
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Re: Extending the PBJR Z axis

Postby RetireeJay » 2013-Jul-Mon-11-Jul

I think that all the Printrbots share the same firmware. There is a hard-coded limit, but it is at least 200mm because the PB Plus can go that high. There's a whole long thread in this forum about extending the Z axis even further for modified Printrbots
viewtopic.php?f=21&t=2239&p=28820&hilit=z+axis+height#p28820
- but I think you should be able to reach 200mm without modifying your firmware.
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Jul-Mon-14-Jul

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Re: Extending the PBJR Z axis

Postby SilverFingers » 2013-Jul-Thu-13-Jul

So I got my rods from McMaster Carr, and it wont let me go further than 100mm either. We need a fix for this!
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Re: Extending the PBJR Z axis

Postby getSurreal » 2013-Aug-Mon-17-Aug

They must have flashed a bunch of printrboards for the Jr. and sent them out for everything. My Printrbot Plus v2 would not travel the full distance on the z axis and one of the motors directions was flipped (y axis I think) until I reloaded the latest firmware. Try reloading the latest printrboard firmware.
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Re: Extending the PBJR Z axis

Postby mrsamnc » 2013-Aug-Thu-08-Aug

JonS, how's it going? Any luck pushing through the 100mm barrier? You're like Chuck Yeager for us PBJR owners. :lol:
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Aug-Thu-11-Aug

No update yet. I've been otherwise occupied. I need to try the new firmware that lwalkera posted.

I'll see if I get time this weekend to give it a go.
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Aug-Sun-22-Aug

I can now go beyond 100mm in the Z-axis!

My Y homing is all messed up, so I've got some work to do to sort that out.

Something that's strange: I've set my maximum height up in the Printer Shape configuration tab in Repetier, but while I can go above 100, Repetier shows the height in red. Where's it getting that 100 soft limit from?
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Aug-Tue-00-Aug

I had to reverse my y-axis plug (and change back to positive calibration). Everything is working now.

I how have up to 7-inch of z-height!
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Re: Extending the PBJR Z axis

Postby Lemm » 2013-Aug-Tue-01-Aug

And what have you done in fact ? Firmware update or just setting the limits in Repetier higher ?
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Aug-Tue-01-Aug

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Last edited by JonS on 2013-Aug-Wed-00-Aug, edited 1 time in total.
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Re: Extending the PBJR Z axis

Postby Lemm » 2013-Aug-Tue-02-Aug

thank you for the summary :)
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Re: Extending the PBJR Z axis

Postby mrsamnc » 2013-Aug-Tue-13-Aug

Yes! Thank you! I'm adding this to my mod list for sure!

So what X/Y/Z lengths are you going after? What length did your Z rods end up being cut to? The 800mm rods are quite pricey. :)
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Aug-Tue-15-Aug

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Re: Extending the PBJR Z axis

Postby lwalkera » 2013-Aug-Tue-15-Aug

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Re: Extending the PBJR Z axis

Postby JonS » 2013-Aug-Tue-22-Aug

Here's my first 7-inch tall print!

Image

Previous biggest owl versus Mega-Owl!

Image
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Re: Extending the PBJR Z axis

Postby Lemm » 2013-Aug-Tue-23-Aug

wow and printtime ?? :D
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Aug-Wed-00-Aug

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Re: Extending the PBJR Z axis

Postby DJNOS1978 » 2013-Sep-Thu-07-Sep

Why is everyone only extending the z-axis? Is the x and y limited to firmware? Why not just "flip" it?
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Re: Extending the PBJR Z axis

Postby mrsamnc » 2013-Sep-Thu-07-Sep

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Re: Extending the PBJR Z axis

Postby DJNOS1978 » 2013-Sep-Thu-09-Sep

So it is very possible, although more difficult, to extend the x and y axis also? Is the firmware the limit to how big a printrbot can be?
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Re: Extending the PBJR Z axis

Postby REPRAP SQUAD » 2013-Sep-Thu-10-Sep

Yes the firmware has a hard limit to my knowledge. I do know that the simple has a limit as well as the plus. The simple extensions that they recently added require a firmware update.
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Re: Extending the PBJR Z axis

Postby REPRAP SQUAD » 2013-Sep-Thu-10-Sep

I would assume that you could load up the new firmware that is designed for longer axis's on the jr v2. That should allow you to at least e tend to the size of the new larger v2. At least tgats what I would do and save myself a huge firmware headache.
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Re: Extending the PBJR Z axis

Postby JonS » 2013-Sep-Thu-10-Sep

Extending any axis requires a firmware change. So once the z axis has been extended the new firmware would allow extension in the other axes too.

The reasons I only have extended my z axis? One, it only requires new off-the-shelf metal rods that can easily be cut to length (it doesn't require construction of a new x,y carriage); and two, I had only recently installed my new heated bed and borosilicate glass plate and I didn't want to throw them away and buy new ones.
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Re: Extending the PBJR Z axis

Postby Lemm » 2013-Sep-Thu-11-Sep

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Re: Extending the PBJR Z axis

Postby DJNOS1978 » 2013-Sep-Thu-11-Sep

I was under the impression from reading the forums that the firmware is the same on all printrbots, except for the simple. Is this the case?
If not then I assume you would need specific firmware??? I also was under the assumption that 8x8x8 was the max print on all printrbots due to the firmware. But I saw someone had a z-axis at like 24". What sets this?
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Re: Extending the PBJR Z axis

Postby REPRAP SQUAD » 2013-Sep-Thu-13-Sep

They have an even larger z axis then that. Its called the super z. Im not sure of the size of the jr v2 bjt I know its the same as the LC since it took its place. At Printrbot. Com they list under specification the size of the models. Theres all kinds of different firmware. The simple has atleast 2 different firmwares, jr is different as on of its axis is the opposite of other bots, the plus has its own and also Printrbot will soon be releasing even more firmware for the Printrbot plus v2.2 and v2.3, which makes your plus even wider. Also the plus has another one for the lcd/dual extruder setup and soon to have 1 for the triple extruder setup. Thats not even including all the non-official branches of firmware.
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Printrbot Plus V2 W/
*Dual extruder PB Version (2-Ubis 1.75mm hotends)
*Heavily Modded and all axis extended
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REPRAP SQUAD
Metal hotbed butt
 
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Re: Extending the PBJR Z axis

Postby DJNOS1978 » 2013-Sep-Thu-14-Sep

I will go read some more. But from what you are saying....Any modification will need new firmware. How would I know which firmware to get? If I wanted to go for the super z axis what firmware is suggested? Is it in the package?
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Re: Extending the PBJR Z axis

Postby mrsamnc » 2013-Sep-Thu-15-Sep

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Printrbot Jr. - July 2013 Model | Heated Bed | Brass M8 Rod | GT2 Pulley/Belt | Tool Less Belt Tensioners - by Mochaboy | Jr. Printr Cup

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Re: Extending the PBJR Z axis

Postby lwalkera » 2013-Sep-Fri-15-Sep

The unified firmware on the printrbot github page will work with all current bots with or without LCD or Extrudrboard. All you have to do is set your limits and calibration, then save them to EEPROM.
https://github.com/Printrbot/Marlin/rel ... unified-v2
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Laine Walker-Avina
Printrbot Beta-tester and Printrboard Designer
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