In v3.0 I fixed some fitting issues caused by me changing the printing material from nylon to resin. I also made some minor adjustments to the joystick radius, the rear hook, and reworked the rear pillars in the bottom shell, in the hope of making more room for a larger battery. Also, with the resin printing, some geometries leads to indents in the printed product, which I had to arduously fill up with putty. The indents seems to correlate to thin wall in between two thick walls, so I made some changes to the model to make the wall thickness more even. That ought to fix the indents.
Due to reasons, I haven't been able to actually print out the v3.0 3d models and test them, so there might by small problems. If you are unsure, you can always try the previous version, which is proven to work, but needs fitting adjustments (aka sanding) all over the place.