Printed slides or wheels for T-Slot aluminium extrusions?

Printed slides or wheels for T-Slot aluminium extrusions? aluminium slot T Slot Aluminium extruded profiles are used to create a framing system that uses the slots along the face of the extrusion to hold a variety of nuts and aluminium extrusion t slot Aluminium T-Slot Profile for quick and easy clamping of workpieces and CNC accessories

aluminium extrusion t slot I used aluminium extrusion 2020 for the robot frame that I designed together with Basti Kuhz

aluminium t slot track Slot 8 30x30mm Aluminium Extrusion, Aluminium Profile 4 open slots Priced per metre Lightweight, rectangle aluminium extrusion 3030 with 4 open 8mm slots  Aluminium T-Slot Profile for quick and easy clamping of workpieces and CNC accessories