Prusa Z Rod Constraint by ScribbleJ

Prusa Z Rod Constraint by ScribbleJ Jul 5, 2011

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Description

Inspired by the Z rod constraints on the Makergear Prusa.

You can print 2 or 4 of these and use them to eliminate all Z wobble on your Prusa.

I've included some before-and-after photos from cubes but the REAL visual proof will be when I reprint the OH shot glass.

BEFORE! thingiverse.com/image:63205
AFTER! thingiverse.com/image:63204
SAME GCODE!

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License

Prusa Z Rod Constraint by ScribbleJ is licensed under the BSD License license.

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Instructions

Print, stuff with one 608 bearing each. Works OK for 5/16ths too. A C-clamp may help you fit the bearings.

Prusa Z Rod Constraint by ScribbleJ is licensed under the BSD License license.

By downloading this thing, you agree to abide by the license: BSD License

Download All Files (7 kb zip file)

File Name

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sj-zstab.stl

Last updated: 11-07-05

Last updated: 11-07-05

Downloads: 1037

Size: 1kb

1037 1kb

Comments

Boner on Mar 18, 2013 said:

Great!!!

N314 on Aug 22, 2012 said:

I printed two, put in the 608s and installed them on the machine.

No print difference and there is a distinctive z wobble.

What did I do wrong?

jamesglanville on Jan 6, 2012 said:

Wow, a BIG improvement. I can't help but think the fact that these help is a sign that the z-bearings aren't doing their job, I would have previously thought it'd be better to constrain the threaded rod as little as possible so the wobbles aren't transmitted to the X-axis, but apparently not.

on Apr 16, 2012 said:

I'm using Nophead's z-couplers with some really soft tubing and i'm getting no wobble at all. No constrains needed.

jamesglanville on Jan 6, 2012 said:

top and bottom for me btw. Also I've found it better to put some heatshrink over the threaded rod, and really force the bearings onto that for the best reduction in wobble. I also fitted the couplings afterwards, which seemed to align them better.

Blobber on Dec 16, 2011 said:

brilliant! going to print myself 2 of these now :)

Anonymous on Jul 30, 2011 said:

are these more effective near the top (near the motors) or the bottom?

my motors are bolted down, I was finding the motor lifts a bit and wobbles.

ScribbleJ on Jul 31, 2011 said:

I use them at the top and the bottom, just to be sure.

RichRap on Jul 15, 2011 said:

One of my very first upgrades, thanks ! :)

prusajr on Jul 6, 2011 said:

You've bolted down the Z motors, havent you? thats why you need this :-)

AnthongRedbeard on Jul 6, 2011 said:

when you have wobble plus motors arent bolted down you can get variable layer height, because the motor goes up instead of the x axis. I think this is an excellent idea, better than having the bottom of the bars floating.

ScribbleJ on Jul 6, 2011 said:

No - the motors aren't bolted down. We're just not all printer-building-experts, I guess. :)

AnthongRedbeard on Jul 6, 2011 said:

simple concept, great execution, thanks for sharing.