Differential drive system works. Pic and webm related.
update: it’s fully autonomous now:
Fuck. I am not sure if it is me going full retard again of me being just realistic. I think i have to row back a little. First building this shit with some lego parts was a bad bad idea. It’s unstable as fuck. Second printing the parts myself is a huge effort. Third doing differential drive on my own would complety go over my head and would not give me good success shortterm (maybe longterm though). So now I should just KISS. Therefore I mounted two DC-Motors on one of those chink arduino robot 2wd frames and will do really really simple tasks now. If I need parts, then I can still print them. pic related.