Recommended to print the bracket flat with tree supports only on build plate. This will make them easier to remove from the locking slots inside the bracket. This will require more support material than if you didn't have supports only on build plate. Attached pictures of recommended print orientations.
The author remixed this model.
Added handles to the pins for easier removal. Also added twist to lock the pins so they don't fall out. Pins were a little difficult to twist to lock into place so I added 0.1mm more tolerance, did not test to see if it was too loose. Both pins can be removed but you only need to remove one to replace the paper towels