Ursa Crawler

I have built this. I wanted a crawler version so I shoe-horned a 4:1 gearbox into it. I remixed this: https://www.thingiverse.com/thing:2829974 and made it 107% larger to make it stronger and big enough for screw pattern of the motor. I made a cut-down propellor shaft for the rear, it totally clears the motor (it is made to fit with the shorter full diameter section to the rear). The upper "A" arm for the rear axle is also modified for the motor being farther back. There is a bit of post print machining to attach the planetary, nothing fancy, a couple holes and countersink. That way you can adjust the hardware as you build. I had a bunch of springs to a modified the spring holder tubes and bent up 4 identical springs from a long one. I may put shocks on later. It needs a receiver and pick out a body. The cut-down shaft, steering knuckles, and planetary are PETG, the rest is PLA. PLA should be fine for most gears as the 4:1 will take the heavy load. Also added frame extension. I need to