this print just allows you to place the washers in mid print (at 50%) to trap them in case you dont quite have the right sized washers like myself and dont want to glue them in. i used 18mm washers about 1.4mm thick, i believe this was originally designed for 20mm washers.
The author remixed this model.
I covered the holes for the washes so you can place them mid print incase you are using slightly smaller washer and dont want to glue them in.