This is a flexible track for the Staind tank designed to be the same "length" as 48 track pieces, i tested with Semi flexible generic TPU, it might not work with very flexible materials like ninjaflex you can try but i think it might slip on the drive wheel, i used the improved wheels and drive wheel from the links below but with stock tensioners (only printed the wheels from the two links below)
this is still a wip but it seems to be working well, not jumping off the drive wheel and seems to have good grip but i still need to test it more.
don't force it/ pull on it too hard to make it fit or it might break the small circular tubes sticking out of the side to hold the bearings.

what i did to install them is remove the side plate and the front sprocket wheel, easily install the track and then insert the removed front sprocket back on the track without putting it on the plastic small tube that comes out the side then you can start installing the side plate starting from the three small screws in the back and lastly putting the front sprocket wheel in it's correct place with the metal screw.

Thanks a lot Andre for this great print !

links to improved wheels:
https://www.thingiverse.com/thing:2743302
https://www.thingiverse.com/thing:2952438