I marked the position of the rows of balls of the with a permanent marker on the outside of the LM8UU linear bearings so I can orient them in an optimal way when I will mount the x carriage.
The step where the zip ties are mounted to hold the rods in place should come first so that the machine can be flipped over to mount the belt.
Additionally, the y_idler_mount could be redesigned in a way that it takes the same M5x12 screws as the rod holders to mount them (instead of the M5x10). Thus the BOM would be reduced and assembly simplified.
While all my other 3D printed parts fitted perfectly my y_idler_mount broke apart around the inserted M3 locknut. My parts were printed with Prusament PETG using the specific profiles from PrusaSlicer incl. flow and step calibration.
"y_idler_mount" or “y_rod_holders” could be redesigned so that only one type of screw is needed (M5x12 or M5x10) and thus BOM is reduced.