i have some things that i want to make, most notably a holder for a d20 spindown dice like the ones used in MTG, but i cant find it on thingiverse, and i am struggling to learn 3d moddeling software. al the free ones are quite cumbersome… any suggestions? i was a wizzare with autocad r14 back when i was in highschool but that was back in the 90s… any suggestions?