The file 'LARGE SPIRAL With Cutaway For GraviTrax – So You Can Actually See The Marble 3D Printer Model' is (stl) file type, size is 1.7MB.
Remix so that you can see the marble as it descends the spiral.
Large Spiral 1 - Same depth as the original spiral but with a cutout so you can see the marble as it descends into the depths of the spiral. It's not pretty, but I was working within the confines of the original design.
Print right side up, with supports, for the best smoothness of the marble track. However, this will leave a rough underside which is unsatisfactory. The entire thing needs to be redesigned to print in a shell form on the plate. Since supports are needed anyway, might as well convert that to infill and print a good looking part without the rough surfaces remaining from support removal. So that remix will hopefully be coming soon.
LARGE_SPIRAL_1.stl | 4.5MB |