CxChanger Carriage 9/10mm Monolith Gantry

Printhead Backplate – Monolith Gantry remix (9 mm / 10 mm belts, MGN12H) A remix of the printhead backplate, modified to work toward the Monolith Gantry belt path with 9 mm belts (10 mm should also fit). WORK IN PROGRESS – not test-fitted yet. Checked in CAD against the Monolith Gantry 300 x 300 STEP (V2, 9 mm belts) only. What changed from the original - Belt slots lengthened from 2.5 x 8 mm to 2.0 x 11.4 mm and moved to the Monolith stacked belt heights (belts sit 2–11 mm above and below the X bearing center). - 4th MGN12H mounting hole opened to a 3 mm through-hole. The original only had 3 of the 4 holes of the 20 x 20 mm pattern going through. - Small notch under each top ear filled in to keep a 1.2 mm wall around the taller upper slots. - Everything else is unchanged from the original. Known issues - In the Monolith STEP the belts sit 0.9–2.2 mm in front of the bearing face, which is inside the thickness of the side wings. The belts line up with the slots in height, but belt routing/clamping still needs to be worked out. - Slot width is 2.0 mm. If your belts are tight, open them up with a file or scale back toward the original 2.5 mm. Hardware - 4x M3 screws into the MGN12H (20 x 20 mm pattern) Printing - Flat back face down, no supports expected - ABS / ASA or similar, 4+ perimeters, 40%+ infill Credits - Original backplate: [author + link] - Monolith Gantry: Monolith3D - Belt path reference: Xol Carriage for Monolith by WaschBaer https://www.printables.com/model/1639728

Update11/15/26 1:23am Back wall extruded about 2mm more swell as the belt outer walls for rigidity the AI version used the cnc after I printed it I knew it would break so second try.