Bind-Reducing X Ends for MendelMax & Prusa and MendelMax.com precision leadscrews
by kludgineer, published
Note: The leadscrews these weere designed to be compatible with are no longer available. You can still use these with a printable nut adapter such as these: thingiverse.com/thing:23326
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I took some pictures to illustrate the issue. See this link: http://imgur.com/a/JxyUZ
You *can* use the same clamp on both ends, but you need to secure the MTW Leadscrew with screws of an exacting length that must not touch the clamp below (not so secure). The heart of the issue is with the stl of the idler itself, and could be corrected if the 3 holes securing the MTW leadscrew were reversed. In case there is an issue linking to an imgur album, here is a direct link to a pic that summarizes the issue:
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Uses eight SDP self aligning bushings, available from Stock Drive Products ( sdp-si.com/eStore/Direct.asp?GroupID=469, also available from store.makerstoolworks.com). Four in the idler end for the anti-binding feature, and four for the Z axis bushings. It is compatible with either 8 or 10mm bushings in either bronze or PTFE-filled acetal. Use bronze with precision shafting or PTFE with drill rod for best results.
The motor end clamp and the delrin nuts all attach with M5-20mm screws and nuts.
Update: Added an alternate version that clamps on both ends. This eliminates the anti-binding benefits, but is easier to print reliably. With the easily adjustable Z axis shaft spacing of the MM 1.5, the non binding features are less important than they were on earlier versions. This version uses the same clamp as the motor end.
Update: Added an optional lead nut adapter to use with select 3-hole leadscrews such as the new ones sold by Maker's Tool Works ( store.makerstoolworks.com/motion/z-axis-lead-screw-and-nut-set-of-2/ ) and the PBC leadscrews sold by Trinity Labs.
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