I have a 3D printer myself
I tell you guys what, I will print a few test tracks for you guys if you provide me with the STL files. I have a max resolution of .1mm (.05mm here soon hopefully) and some nice glow in the dark plastic ABS currently. I have printed everything from phone stands to measuring cups, now I can add tank tracks to it
There is another way to have fun with printing big things, I just recently read of a guy printing a whole body of a car. He drew it up on the computer, cut each piece so they fit together, and printed one piece at a time. Then he connected them and fiberglassed over it and had a new car (I think it was an old Ferrari if I remember correctly). You could do that with a tank too and either cast or fiberglass it. Either way, that is a big project and a LOT of plastic. Glad it is dirt cheap atm. about $35 for a kilo of ABS.
1/10th RC rim with tire mounted:
https://www.dropbox.com/s/e3409voinm...2022.34.53.jpg
The right rim is before acetone bathing, and the left is after.
1/16th RC sand rim:
https://www.dropbox.com/s/q7l0p54lyu...2018.01.15.jpg
This one is all rim, no tire. I was gonna spray some rubber coating on it, but someone ending up trading me something for them.
I print all kinds of things
RC is my favorite