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Need help troubleshooting your BoXZY 3D Print Head? You're in the right place!

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Question Closed

Z axis wobble issues

Description: When I print anything taller than 3 or 4 mm, prints come out with repeating x-y axis wiggle all the way around.

Does anyone else have this problem? Is it something I can fix?

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Update (11/15/2017)

Ok, new bearings are in and part of the problem is gone! It's nice to have new bearings, and taking boxzy apart a bit gave me a better appreciation for some of it's components. Unfortunately, the alignment on one of the linear rails is off. I don't know whether it's one of the end mounts, or the location of the mounting of the linear bearing (perhaps it's off center?) but with both the old and new bearings the rod had to be bent (forced) to fit into their proper places.

I followed the directions in the guide for replacing them, and was very careful when it came to tightening the bolts again. Any thoughts on how I should fix this? It's putting unnecessary pressure on the bearings.

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2 Answers

I would try replacing your Z axis linear bearings.

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I can see some of the logic behind that, but to cover the bases could it also be anything else?

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Also, what is the part type for the z axis linear bearing? I looked through the guides but did not find it.

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There are a few things it could be. Most common is bad or improperly installed bearings (part # LMK12UU). Too much preload pushing the bearing against the rail in any one direction will cause excess vibration. Next is an overly tightened ballnut clamp. Less common, but more serious, is a bent ballscrew, warped ballnut (excessively over clamped at some point) or excessive wear/grooves in the linear rails.

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Is "improperly installed bearings" something I can solve be re-installing the current bearings, or do I need to get new ones? I haven't had to source new bearings before, are there any suppliers I should aim for or avoid?

These ok?

https://www.banggood.com/LMK12UU-12mm-Sq...

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If them being improperly installed hasn't permanently damaged them, yes. With these bearings its hit or miss for suppliers. You can get them all over amazon, I personally use robotdigg. They change suppliers randomly, but I've always been happy with the quality. THK brand bearings are best if you can find a source, but they are hard to locate in the US.

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Robotdigg was where I looked first, but the $31 shipping for 2 LMK12UU seemed steep. Is there a code for a better rate, or do you shell out every time?

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Did you loosen the whole arm for the platform and re-tighten it after everything else was in place? If not, that's the place to start. Careful when tightening it back up, you have to tighten very slowly or the turning of the bolts pushes the arm in the direction of the turning.

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That I did not do, and will do so. Should I loosen the linear bearing again too? Thanks!

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I usually loosen them both. Then I tighten the arm followed by the bearing.

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