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Slim LM8UU Holder Parametric

by jonaskuehling, published

Slim LM8UU Holder Parametric by jonaskuehling Jan 18, 2012
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Summary

Slim, revised variant of jridley's parametric ziptieless SCAD LM8UU holder.

I never liked snap fit solutions for parts that rely on precision. In particular the current Prusa design uses two different ideas for LM8UU holders which either lead to heavy warping of the whole part when inserting the linear bearings because of a very tight fit (e.g. x ends) or snap in easily (in case you don't brake them..) but leave a faily loose fit needing additional zip ties to fasten them (e.g. x carriage).

This is why I appreciate CdnReprap's attempt to have a pecisely fitting, yet tightenable LM8UU holder which can be disassembled as many times as you desire, leaving the bearings on the smooth rods.

Update V1.1 (2012-01-23);

  • changed mountplate to be parametric too
  • using polyhole function for LM8UU-hole in hope to achieve even better fit

Instructions

Download STL, slice it, print it! (At least 50% infill recommended, choose solid infill and change parameter body_wall_thickness to 3mm to be safe)

Assemble with M3x20 hexagon socket head cap or crosshead screw an M3 nut.

SCAD file can be used as module, offering mountplate option = true/false.
All parameters are editable via SCAD file.

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Really like these clamps!!!!  Will be used frequently on my projects!.  Thank you for sharing!

I like this - is there any mod to support http://www.thingiverse.com/thing:13228http://www.thingiverse.com/thi... ?

It appears that when I change the SCAD to bring the plate holes to external dimension of the 27MM to accommodate the AO X ends then the screw head ~may interfere with the body of this.

I guess I could alternatively alter the AO X ends to meet this...

Aleph Objects Clamp X-ends

nice design. Im trying to make a cnc, and I didnt feel comfortable either with snap in lmUU holders, so you saved me quite some time and effort with your piece

thanks for the design -- been meaning to make a better lm8uu y-holder and now i don't have to! only thing i changed was i turned one of the m3 mountplate holes into a slot to accommodate the poorly drilled holes on my y.

Nice!

I had to change the scad file to get the mountplate (maybe I need an upgrade?)

        if (with_mountplate

&
gt;0)

In PLA I used body_wall_thickness = 3.6; and 100% infill otherwise they just broke too easy.

They will support my new heated build plate. ABS here I come.

You're right, I used them for a quick y carriage mounting frame and had to scale the wall_thickness up to 3mm. Printed with 50% infill, rectangular infill pattern (slic3r), 3 perimeters at 0.3mm layer height using a 0.35mm nozzle they came out pretty robust.

I will modify the scad file for 3mm walls as default and add some recommendations for slicing under instructions in a second.

Good to hear you liked it, though :-)

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