pulley for aliexpress 6X2 wheel($18 each)

option 1: print pulley and pulley adapter
option 2; print pulley adapter and use vex robotics versa pulley

details here: https://www.electric-skateboard.builders/t/cheap-ass-6x2-pneumatic-belt-setup-3d-printed-pulley-vex-versa-pulley-files-available/65559

print solid for strength