Universal Joint Z coupler

by triffid_hunter, published

Universal Joint Z coupler by triffid_hunter Nov 20, 2012
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An experiment intended to reduce Z wobble in prusa i2 printers.

The holes are deliberately sized to fit perfectly straight off the bed. The holes in the wings should allow an M3 screw to slide through without much resistance but also without much play, the holes in the centerpiece should be super tight so you can actually cut a thread by driving the M3 screw in.

The motor shaft has a single nut trap for the flat, the threaded rod has 3 nut traps in case some alignment is needed.

8x M3x10 or M3x15 screws and 4x M3 nuts are required for each Universal Joint.


1) print
2) assemble using M3 screws
3) install
4) post before/after picture as an "I made one" :)

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no more z-wobble! thanks!

It was too tight all-round for me, so I modified it a bit, see http://www.thingiverse.com/thing:234427http://www.thingiverse.com/thi...

Universal Joint Z coupler, Revised

Printed nicely on my Cube printer with only minimal clean-up afterwards. (I'm not using it for its intended purpose) Used #4-40 screws to assemble.

Have you tested it allready? Any results? Looks interesting :)

 The design is very nice. To be rigorous it is a Cardan joint, and a Cardan joint doesn't transmit the speed linearly (https://en.wikipedia.org/wiki/Universal_joint)https://en.wikipedia.org/wiki/.... But I suppose that for very little angles it can be considered a constant-velocity transmission.
Just to be precise. :)

Add a compensating Cardan like automobiles did for years.