Hollow Spin Down D20 – D20 spin down rỗng

I originally wanted to print a custom D20 in metal, but thought solid metal would be too heavy and expensive. So I thought I would just shell out a normal D20, but it turns out a fully encased shell isn't printable either. One thing led to another and it led to this design. Although I'm not entirely sure if this can be printed on a FDM or SLA printer. 🤔