This is a mold making system to improve moldmaking for dice. The system needs two shell pieces and one funnel. Additionally a small piece of straight metal wire is requiered to use this. In the linked video is a complete explanation of the system and how its used.
For printing on an fdm machine lay the shell on the flattened surface on the side, no supports required. For more stability 3 perimeters andd 4 bottom and top layers are good.
For the funnel piece might be more perimeters needed to have a solid tip to drill in.
Small gaps for tolerance are included in the model file. If those are not enough, comment it and I'll do another version with more tolerance on the connecting surfaces.