Slim tree supports worked great for the main clamp piece. Printed main clamp with track connector oriented on print bed.

The "jaw" piece was a little snug, no supports or bed adhesion adjustments needed. If I redo, will probably scale to 101 or 102%.

The screw piece needed a raft, first attempt came off the bed and failed.

Original source: https://www.printables.com/model/592415-hot-wheels-track-mounting-clamp