Modified Y-Carriage for maximal distance, LM8UU

by Ablapo, published

Modified Y-Carriage for maximal distance, LM8UU by Ablapo Dec 16, 2012


This is a modified version of Jonas Kuehling's "Y Carriage Mounting Frame for Slim LM8UU Holders". It includes two mounting tools: snap_on.stl and rod_end.stl.

The idea is to have a maximum distance of the smooth rods by printing two connected LM8UU holders diagonal on the print bed. You can make a larger print bed for your next new 3D printer with this diagonal technique.

This technique causes a poor alignment of the two holder pairs. But the additional mounting tools will help there.

If the smooth rods are not parallel, a rod fixation clamp can break apart after a while and bearings may fail sooner.

Added a new modification of the LM8UU holder. The enforced side walls reduce the risk of breaking. You should be able to adapt the nuttraps to you needs.

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Adjust the OpenSCAD file and change the frame_length and rod_dist values. To use the OpenSCAD file you need the extra "lm8uu-holder-slim_v1-1.scad" from the ancestor version. Keep in mind the maximum of your print bed diagonal size. The STL-files are for a rod distance of 138 mm from center points. (There is no specific reason for 138 mm.)

You can print the connecting snap_on part, if you need more help for the alignment of the holders. The rod_end part is for checking that the rods are parallel. To get a more precise alignment, mount all bearings and the smooth rods before the fixation on the bottom plate.


  • added a M3 thumb cap
  • added a T5 belt tensioner