All parts can be printed completely supports free, but rafts are recommended to keep the parts attached to the print bed.
The number direction and number rings can be added mid way through the print
I printed the ball part with 0.3mm layer height with 15% infill, and added the direction and number rings 40 minutes into the print – about one third of the way into the job.
When adding the direction and number rings, be careful that you insert them the right way up. The ball is printed upside down, so you will have to insert the rings upside down. /_-_-_\
The opening to the magic ball can be sealed with the triangular viewing hole, or the circular viewing hole. The circular viewing hole part holds in a 42mm disc of clear plastic, such as from vacuum-formed packaging, giving you the clearest view.