Slides: 25mm bearing steel rods, with corresponding linear bearings. The bearings are very noisy, I guess the quality is not amazing - but then, these were very cheap ones. Maybe will upgrade.Gantry: my own design https://cad.onshape.com/documents/74b816c9e6a280822f83de26/w/f705239c28005f4bd09e7a94/e/32dac4f73ea9ce0d062e8e3b...