Marblevator Mini, Loop

cults3d

I had to dig out my physics textbook for this one...\n\nHow fast is too fast for a marble machine? Well, check out the video "Marblevator Mini, Loop High Speed Test", at 324,000 marble runs per day, it's indeed the fastest marble machine I've ever designed.\n\n"Marblevator Mini, Loop" isn't quite as "mini" as my previous Marblevator Mini designs, but is still relatively small, and features a 7.5mm radius loop with a tapered auger lift. \n\nA video of Marblevator Mini, Loop stress test can be seen here: https://www.youtube.com/watch?v=-RsX8fvJLVE\n\nA video of Marblevator Mini, Loop in action is available here: https://www.youtube.com/watch?v=8Ve0sO8ITDM\n\nUsing a few relatively simple physics equations, the height of the entrance ramp (H) is determined by the equation H = 2.7R (where R is the radius of the loop). My desire to keep the model small dictated the loop radius (7.5mm) and ball bearing diameter (8mm). And to add friction compensation, especially for a 3D printed track printed in this orientation, I increased the height of the ramp over the calculated height of (2.7 * 7.5mm) or 20.25mm.\n\nRequiring only three 3D printed parts (base, track and auger),the track part may indeed test your skills and those of your 3D printer. I've printed the track both with PVA support and without support at .1 and .15mm layer heights and discovered that on my printers with PVA support, no filing or sanding of the track was required. If no support material is used, you will likely need to file and sand the inside edges of the track until reliable operation is achieved.\n\nAs usual, I probably forgot a few files or made some other mistakes, so if you have any questions, please don't hesitate to ask as I do make errors in plenty.\n\nDesigned using Autodesk Fusion 360, sliced using Cura 3.3.1 and printed in PLA on both an Ultimaker 2+ Extended and an Ultimaker 3 Extended.