Ultimaker Z-stage spring-screwblock
by frollard, published
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They are better than the originals that came with the kit. i have printed them out 100% only needed to drill the holes a bit
That would make for a good fix -- my motor short belts are wicked tight; the long ones are a bit looser but still pretty taught. at half-run they make a good rubber twang...
If your printer is shrinking holes, it is almost assuredly due to belt slop.
I had the same problem and found that the short motor belts were loose. Tightening those helped a lot, but there was still signs of slop. Thus, I added belt tensioners.
Round holes, components sized exactly correctly, and no gaps between walls and fill.
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Because of the shrinkyholes and the 'print at 95%', I had to make the center bore larger than it should be (almost 3.4mm) and it comes off the printer at around 2.8mm diameter - just small enough for the screw teeth to have something to bite into.
-- they suggest putting a piece of paper down the bore with the screw - I figured since I have a 3d printer, do it properly!
Long story short:
"Screwblock Large.stl" *the one I use, 3rd on the right in the picture of 3*
ABS (pla should be fine)
2 walls @ .4mm nozzle (more is fine just they won't fit, ymmv).
"Screwblock original.stl" *middle in the picture of 3*
same settings, but you'll have to sand a few thou off the outside edges for it to fit in the machine, and maybe ream out the hole - depends on your printer.
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