Simple Train Tracks for Thomas the Tank Engine Toy. Fits 12 in x 24 in space.
Mk3s (vol: 250 x 210 x 210 mm) can fit 3 curve pieces on one print bed, and then 2 straight and 1 curve pieces on another. This means you can have a working loop in two prints!
This is the toy shown: https://www.amazon.com/Thomas-Friends-Motorized-Engine-Preschool/dp/B09C1KNLDH. The turn radius is a little tight, so it doesn't good full speed / makes some noise on the curves. I'm attaching a less sharp curved piece for those who have more space (I needed this to fit on a small desk space).
The author marked this model as their own original creation.