RC Tank - Track mods v1

This version of the tracks is mostly superseded by version 2: https://www.thingiverse.com/thing:3172412

Here are 4 modified versions of the tracks from RC Tank, published by Staind. They are intended to increase grip while still being easy to print. During testing, I preferred combining the tracks with nails; therefore some files are with 3mm holes for 3M screws and 2mm holes for 2x20mm nails. Nevertheless, drilling is mandatory. When using nails the outside holes should be drilled out slight