This is a fun piece of terrain that I often use in my games.
There is a slot cut in the bottom that allows you to slide in artwork printed on a piece of regular printer paper, cut to 45mm w x 51mm h when folded (so you can have colour on both sides).
Included is a pdf of the artwork I have used, but you can print or draw your own.
portals_high_def.pdf | 15.6MB | |
Round_Arch_with_paper_portal.stl | 660.4KB |