Sliding wardrobe door roller carriage
Sliding wardrobe doors ride on small roller carriages that split along the axle after years of use, making the door drop and scrape. A carriage is a 60 x 20 x 35 mm body with a 28 mm diameter, 6 mm wide wheel on a 4 mm steel axle, two M4 mounting holes 40 mm apart and a rim that keeps the wheel in the track channel. Print the body flat in PETG at 100 percent infill and the wheel on its face so the tread is smooth.
SpeakCAD generates both parts to the measurements of your track and door bracket rather than a generic profile, so the door hangs at the right height again. If the wheel rubs, ask for a narrower tread and regenerate. Seeing the model in your browser costs nothing.
Design a sliding door roller carriage: body 60 x 20 x 35 mm with two 4.2 mm mounting holes 40 mm apart, a slot for a 28 mm diameter 6 mm wide wheel with 1 mm clearance, a 4.1 mm axle hole, and the wheel as a separate part.