I would have thought that the upright TC02C gearbox is best left on its floppy plastic chassis.
A stiffer chassis would usually go hand-in-hand with a laydown gearbox such as the AZ or my HBI Dino.
I believe that AZ are now printing a 3/4 gear upright gearbox but I don't know what it attaches to.
I do it my way. ;-)
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