Bind-Reducing X Ends for MendelMax & Prusa and MendelMax.com precision leadscrews
Derived from
Description
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
Instructions
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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What's the recommended density for printing this part in ABS?
Thanks,
Chelmite
any chance you could post the solid file for the clamping version of the idler? the zip file only contains bushing version. Thanks!
Hwy could you post the alibre files for these I particularly want the non binding version. I printed it fine but my slicer made the holes too large, so the bearings just fall out. Thanks
Would you consider a second idle version comprised of a body and clamp similar to the motor end? I seem to be having problems printing circular bearing holes with my Prusa. They print out slightly flat on the lower outside corners.
Great work. I printed the parts and bought the bronze bushings (10mm) you recommended for the Z rods. It seems that the outer diameter of the bushing is slightly too large to fit in the ends of the X-end parts. What technique would you recommend to get them to fit? I suppose I can sand the interior of the PLA tube with my dremel. I might also heat up the piece in an oven set for 210C and insert the bushing when the plastic is soft. What do you think?
I recommend 8mm linear shafting for the X
&
amp; Y and 10mm for the Z. The loads on the X
&
amp; Y axis are purely in line with the shafts, so making them thicker would have a negligible benefit. The Z axis also carries the X axis, so it has side loads, so increasing the thickness of those shafts is more beneficial.
Thanks for adding some description around these, I'm in the process of building a 1.5 and was wondering what the deal was with the larger diameter holes on the Idler. Makes sense now, I better buy some more bearings then :).
So would this be a bug correction for MM v1.5 (like v1.5.1)?
No, These were designed for MM 1.5, but are not specific to it. They ccan be used for any printer that uses the same shaft
&
amp; threaded rod spacing as the MendelMax (for example the Prusa).
Because of that, and because these rely on parts that you can only buy from me (the leadscrews), I am posting these as a separate item instead of as part of the MM 1.5 thing.
Are you able to get the X-axis belt tight enough without significantly deflecting the Z-rods with this design?
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Unless I'm missing it, could you post the alibre file for the clamping idler? I see in the zip file is the bushing version of the idler. Thanks, much appreciated!
The source file has been updated to include that part. Thanks for letting me know!