This is a mini level for the Gravitrax marble run. Print upside down. It's probably hard to print it as transparent as the render, but colorFabb nGen Clear might be a good option.
Here's a video with most of the elements in my library. And... a preview of the lapse timer I am about to release. The lapse timer has custom electronics that I will be making in small batches. If you are interested in the lapse timer drop me a message. If there's enough interest, I could consider ordering larger batches of circuit boards and components.