After printing thing www.thingiverse.com/thing:507254 I realised the buffer could not slide on to LGB rails. The parts hit the nails for the rail-fixtures.
Removed ~2.5 mm material from the feet to have enough clearance to slide on LGB rails.
Printer:
Creality CR10
Rafts:
Yes
Supports:
No
Resolution:
0.2 mm
Infill:
20%
Notes:
A brim is needed to print this part now. The surface area of the supports is too much reduced to print OK.
The author remixed this model.