Mablevator, Keychain

"Marblevator, Keychain" is perhaps the simplest of all my Marblevator designs. Consisting of a single 3D printed in place Marblevator and a single 4mm diameter ball bearing, this Marblevator is "keychain" ready in a few simple steps. As usual I probably forgot a file or two or who knows what else, so if you have any questions, please do not hesitate to ask as I do make plenty of mistakes. Designed using Autodesk Fusion 360, sliced using Ultimaker Cura 4.12.1, and 3D printed in PLA on Ultimaker S5s.3D PRINTING SETTINGSI 3D printed my Marblevator, Keychains at .1 and .06mm layer heights with 20% infill and no supports. I found the .06mm layer height to be slightly faster, but both worked fine for me. After 3D printing, I placed the ball bearing in the small hole at the end of the track then squeezed it through the small hole and into the track using slip joint pliers. After that, a simple rapid press and release of the plunger and the ball bearing flys around the track! I hope you