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brentwerder

Irregular Circles on UMO+

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Recently I've had quite a bit of trouble getting technical prints (especially very small ones with tight tolerances) to print right on my UMO+. It looks like my printer isn't printing circles right at all. As you can see, the tolerances here are off by about a millimeter. The irregular circles are very repeatable, too - the odd oval shape is the same through the part.

20170508_170954.thumb.jpg.5f79253fc0d808a65dd8c031f21815e7.jpg

20170508_171021.thumb.jpg.ed4de650be793f0801a26b5487a34da4.jpg

Even just looking at the part, it's obvious that it's not completely circular:

20170508_171047.thumb.jpg.88ac0a86cbbe0ce71ee95e4a5a7574c8.jpg

I've tried every suggestion I could find on 3DVerkstan, which helped the problem a bit, but it's still there and it's enough to keep very small parts from printing correctly.

I turned my acceleration down to 1800mm/s^2, and I printed the part pictured at 15mm/s just to make sure my speed wasn't a factor. My Ultimaker has an E3D V6 with a mount that holds it pretty tightly. I don't think that's likely to be the issue.

I might just want to order some new timing belts for the motors, but those seem pretty tight to me.

Any other suggestions?

20170508_170954.thumb.jpg.5f79253fc0d808a65dd8c031f21815e7.jpg

20170508_171021.thumb.jpg.ed4de650be793f0801a26b5487a34da4.jpg

20170508_171047.thumb.jpg.88ac0a86cbbe0ce71ee95e4a5a7574c8.jpg

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