These are modified z-tops for the Prusa i3 MK3. These allow you to view the lead screws from above to verify alignment, wobble etc. In addition to this, I added a reverse bowden adapter to the right z-top thanks to the help of codiac2600. One version is for a standard M6 bowden tube, and the other is for an M10 Passthrough fitting that works with his reverse bowden system linked here: https://www.thingiverse.com/thing:2823965
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