This license lets others remix, tweak, and build upon your work non-commercially, and although their new works must also acknowledge you and be non-commercial, they don’t have to license their derivative works on the same terms.
This is a simple guide that sits on the dual gantry rails and ensures that the extruder X and Y axis bearings are centrally located within the extruder housing.
No assembly required. Simply print and then place on the gantry with the protruding semi circles inserted into the bearing tunnels. Hold and push the bearings from the other side to ensure located correctly then retighten the bearing grub screws.