I have one of those Torro US halftracks that I've been working on for a while. I bought it used with the quad .50 cal machine guns removed and I upgraded the electronics and removed the battery box from the underside to give it more ground clearance. I've wanted spare tracks for it for a while, but all my searching came up with nothing. I felt like the tracks were a weak point that could fail and then the model would be useless. Spare tracks seemed like a good thing to have...

I 3d printed tires for my next IR moving target 6x6 truck and for a M3A1 scout car I'm building using TPU and when I was done I had a mostly full spool left over. Thinking about what I could do with all this left over TPU I thought about those spare halftrack tracks. It took a few prototypes to fine tune the size, but I managed to design and 3d print spare tracks for my halftrack. I put a more aggressive tread on my tracks than the stock Torro tracks. Now I'm saving my stock Torro tracks in a bag out of the sun and running my 3d printed tracks with no worries about cutting them on a sharp rock or wearing them out. Now I can make more tracks anytime I want.