Marble Coaster Track Clips

This Thing contains a set of 3D-printable clips that can be used for building a marble run or marble coaster. The clips are designed to securely hold 1/4" (outside diameter) polyethylene tubing which serves as rails for guiding a 1"-diameter marble along the track. The tubing just snaps into the clips. I used tubing from Lowes. (The tubing I saw at Home Depot had a somewhat elliptical cross-section which might not fit as well in the clips.) A 25-foot roll of tubing was just enough to make the coaster you see in the photos. Here are links:
https://www.lowes.com/pd/EZ-FLO-0-170-in-Inner-Diameter-x-150-ft-Polyethylene-Tubing/1000365053
or
https://www.lowes.com/pd/EZ-FLO-0-170-in-Inner-Diameter-x-25-ft-Polyethylene-Tubing/1000180489

Some of the clips have flat brackets with screw holes which allow you to secure the track to the supports at 0, 30, 45, 60, and 90 degrees. The holes in the brackets are sized to snugly fit #6 pan-head screws. The clips with no bracket were spaced at 10-c