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Parametric Z base printed clamp/spacer

by triffid_hunter, published

Parametric Z base printed clamp/spacer by triffid_hunter Oct 23, 2011
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Summary

Prusa's rod clamps are all well and fine, but I don't actually want to adjust the spacing from Z smooth rod to frame.

Here's a one-piece connector with optional bearing holder.

Fully parametric, including rod spacing. Match with blddk's derivative of my Integrated Z motor mount+frame vertex+rod clamp - http://www.thingiverse.com/thing:12215

Overall size of the part comes mostly from washer_diameter and the spacing distances.

horiz_distance is the distance between the center of the smooth rod clamp and the threaded rod that goes under the middle of your printer. This can be made smaller (minimum smooth_rod_diameter/2+threaded_rod_diameter/2) if you omit the bearing mount.

UPDATED 9 November
uploaded new files with proper distances, preset to the standard, and M8 holes

Instructions

1) print
2) disassemble half your printer to install

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I actually find that I get better results if I just leave the threaded rod hanging at the bottom and don't try to anchor it. That way if the rod isn't entirely straight, it's held by the X end only. Anchoring it forces any bend to cause the X axis to wobble.

After saying this, I found myself needing one of these after all. This did help some of my wobble, and it also has the advantage that it takes all the weight off of the motors. Great part.

I concur and also do this on my machine, however I've talked to several who swear by affixing the threaded rods, so I made the bearing holder a parametric option.

I believe it's because the couplers aren't very rigid, and the strength of the threaded rod is on par with that of the smooth rod so they fight to guide the axis.

I just posted a new thumbnail of it installed on my printer, and you can see that my Z threads don't even reach down that far!

My mac
hine has extremely flexible couplings (regular vinyl tubing), and M6 rods on Z. one of my rods waves around like a worm poking out of the ground, yet my prints show no sign of distortion on the walls :)

s/aren't very/are rather/

thingiverse needs an edit post option I think

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