SP14 - Assembly of Gear 9
Hi Steve,
I am about to build SP14 - the large moon phase clock.
When trying to set up gear 9, the M3x8mm screw in gear 9b_5 cannot be screwed in tightly enough to fasten gear 9_5 to the 1.5mm arbor. The thread in the gear is not stable enough. I printed gear 9b again with 7 perimeters and an infill of 40% (cubic), but that couldn't be fastened either.
Do you have any suggestion how to print gear 9b_5 so that the screw can be tightened sufficiently?
Kind regards from Germany
Bernhard
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The first question is why your screws are loose and mine fit as expected? I use the default extrusion settings for generic PLA in PrusaSlicer. There are parameters for filament diameter and the extrusion multiplier, but I have never adjusted them. The results have been working well for me with several different filament types.
Have you tried different filaments? Gear9b_5 is small enough that it should be quick to test with other filaments.
Other things to try would be to experiment with the extrusion multiplier or the XY Size Compensation parameter.
Another trick used by woodworkers is to add a drop of superglue to the hole, let it dry, then assemble the component. This adds a thin layer of glue to make the hole tighter. The arbor hole might need to be drilled out again for the proper fit.
btw: what printer, slicer, and filament brand are you using? Also, did you need to drill out the arbor holes? Or were the arbors already loose right after printing? My CAD files always start with slightly oversized holes, but the printed result is always undersized, and every hole needs to be drilled out for the proper fit.