so this is basically a remade remix of https://www.thingiverse.com/thing:2047554 but the holes the bearing go on are 7.8mm and not 8.5 so the 21mm bearing i bought fit on it.
The author remixed this model.
fully remade from scratch but using https://www.thingiverse.com/thing:2047554 as a template ig but the circles the bearing go on are 7.8mm not 8.5mm like the original