Prusa 2 Z-Coupling for pulleys

by mowi, published

Prusa 2 Z-Coupling for pulleys by mowi Mar 29, 2013
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My steppers have machined pulleys fixed on them so the normal couplings do not fit. These fit perfectly.


My steppers have machined pulleys fixed on them for HTD 3M belt. I cannot seem to get the pulleys off. The pulleys have a length of 14.5mm, but the teeth only go untill 10,5 mm.The pulleys have a diameter of 9.7mm with 11 teeth and a 3mm pitch.

You'll need to print both halves twice, the halves are not the same. I could not make them the same because with 11 theeth i needed a mirrored cavity.
Furthermore you will need 8 m4 x 10mm screws and 8 m4 nuts.

If you als have steppers with these pulleys you might also like http://www.thingiverse.com/thing:51618 , an Y bracket you can use when your belt runs close to your stepper

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These are pretty cool. If you get any z-wobble, you might want to look into putting silicone tubing around the m8 rod, and enlarging the hole.

Thanks for the tip, I'll check the z wobble on my next few prints

This is quite clever actually...

The major problem I had with printed adaptors, is that they tend to slip of the motor shafts during the print, compressing the product or ruining it when it comes off. The way around for me was to roughen up the shafts with a saw. This way however you could attach a ring to the shaft, and have the adaptor clamp to it.

More vitamins, but sometimes vitamins are necessary!

Well, you know, vitamins are good for your health and reduce your stresslevels ;)