Note: These X-ends are designed to match the lead screw nuts having triangular flanges. This design allows the body of the lead screw nut to be inserted from the bottom allowing the x-end to rest on the top of the flange. Revises the nut traps to be open to the top. Re-sized them to M4. One trap had to be open to the back. I found that the bearings aligned better if they were pressed together and centered in the part. YMMV. For a full 3d look at the part, the .PVZ file, in the downloads, can be opened in the free app Creo View. Available for PC and iPads.Use config for your standard structural parts. 3 perimeters, 3 top, 3 bottom. Support should not be needed.