I printed the original file in Black PETG, but the kids broke it pretty quickly.

So I modified the file and printed this version in TPU (Both will likely print fine in either material or PLA, I can't speak for other materials as I have not printed with anything else yet) I added a few features to the OG file I downloaded from thiniverse somewhere, I can't find the file at the moment. to the original file I added.....

1. this one file will work for both sides, original had separate "right" and "Left" versions
2. locking features for the tracks because they kept popping off the original
3. puzzle piece numbs and sockets to lock both halves together (sorry they aren't done well, I was in a rush)
4. also added screw holes on the rear tabs and sides next to puzzle piece numbs in case the nubs don't fit together well after printing. I had dreams of mounting the bases vertically, but the kids are too small for ladders yet! hahah (if nubs dont fit in sockets, just cut off numbs sticking out and use the screw holes to mount onto a piece of wood or your wife's new hardwood floors)

You would have to print out 2 and clip them together. let me know if you like this thing if a bunch of people like it maybe I'll spend more time farting around with versions of this or similar.

Update: I am super impressed with TPU (95A) I cannot believe how well this printed compared to what I imagined! support material came off REALLY nicely and you can't even tell it was there... I assumed the support material would be there permanently haha. TPU is a little flimsy for the track locking mechanisms, I should beef that up if TPU is expected to be used, but for now I won't change the file so it can be printed in PETG or PLA or whatever. My kids are gonna have a tough time trying to break these things now that they are kinda flexible hahaha!! the rest of it is plenty ridgid, I mean the tracks are super flexible ant they work great for the cars