SummaryLeave a like! This is version 1.2, if there's any response (Likes, Comments) I will improve the design further ;) . It's designed for Igus DryLin (RJ4JP) but also fits LM8UU You need 1x M3x40 screw + nut (Important! Doesn't work without it!) 1x M3x30 OR M3x40 screw with nut (but also works without) 1x M3 screw which can be shorter, if it need to touch the endstop Object testet 0,15mm layer height, 0,5mm nozzle, 40% infill, 3 outside layers, Esun-PETG and works very good without support. Update History: V1.1 - added second arm for another end-stop-screw on the other side V1.2 - centered the belt holders to be in one line with the original pulleys, now one screw less necessary