Oct 19, 2026, 9:04 AM@quixoticgeek yeah, 7mm of runout means the part is totally scrapped. the two bearings don't line up very well either, so the axle barely even fits. you can see the discontinuity from the layer shift around 10mm down
- Oct 19, 2026, 9:04 AM
Replies
Quixoticgeekquixoticgeek@v.stOct 19, 2026, 9:12 AM@th that's a lot of run out for what looks like a small layer shift.
- Oct 19, 2026, 9:25 AM
@quixoticgeek the gear is 20cm, which means that 7mm of runout at the edge of the gear is about 4 degrees off axis. the two bearings are 20mm apart, so I think that only requires 0.7mm misalignment (by similar triangles). The layer shift appears to be about 0.5mm of skew, so it's in the ballpark (plus I had to use a threaded rod rather than the actual 8mm axle, which adds at least 1mm of wobble).
- Quixoticgeekquixoticgeek@v.stOct 19, 2026, 9:31 AM
@th ah that would do it. Go up a bearing size, and bore out the center to fix the concentricity?
- Oct 19, 2026, 9:34 AM
@quixoticgeek just two problems: t a) I can't swing a 20cm gear on my tiny lathe's 50mm chuck and b) does boring 3d printed filament even work?
- Quixoticgeekquixoticgeek@v.stOct 19, 2026, 9:40 AM
@th clearly you need a bigger lathe... And yes.