Credit to my project must be given any time the machine is shown or shared. From a practical standpoint, that just means no one else is allowed to market or sell the files, plans, prints, or completed machines without my express permission. The license is Creative Commons, Attribution, Non-Commercial, Share-Alike. This machine is provided free to download, print, and build your own. Someone who has no cars with pressed on wheels should probably look elsewhere for a more precise machine, if they don't already have one. As it's designed to facilitate tire truing on a variety of 1/32 and 1/24 size tires on pressed-on plastic wheels (Scalextric, Carrera, Fly, SCX, NINCO, et al), it's not meant for racers who are using precision metal wheels, though it can also be used for those kinds of wheels/tires. It is not intended to replace or compete with precision milled machines for high level competitions. This machine is intended to be a 'good enough' machine to get casual racers started with their tire truing needs. Sanding surface cannot contact axle pulley or o-ring.Distance between sanding drums accommodates most 1/24 and 1/32 wheels/axles.standard 1/32 bushings snap into axle carrier, but V-shape still allows smaller or larger bushings or bearings to stay in place.O-rings can easily be moved side to side to accommodate various axle configurations.Consistent tension of o-rings due to double-pulley design.Indicator knob for precise repetition of tire diameters as needed.

Spring loaded axle carrier to allow 'grind and release' truing methods with ease.Screws beneath the ball bearings to tram (make parallel) the sanding spindle to the axle bracket.

Only four screws to remove/replace the entire sanding spindle for different grits.

Also, Check out Geoff997's remix if you want to build a self contained machine with integrated power and speed control! You can find his Tyre Truer MKIII for slot cars 1/32 and many other great models on his Thingiverse page. I also owe thanks to Giacomo Verlini, aka JamieG from Sweden, for his design for the sanding sleeve drums that I have used for this machine. It was with his input and feedback, along with others in the community, that this machine was finally realized as shown. pressed on wheels) inspired this design to a great extent. His original design for a rotating sanding drum machine for whole axles (e.g. G is for Gaub, or Greg, whichever you prefer.

3d printed slot cars