Fury of Dracula: Location Card Holder

thingiverse

Good old Dracula might be getting a bit senile in his old age, forgetting places he's been. This accessory will let him see his recent locations without revealing them to the other players (who are still able to see the back of the card). It is placed on top of whatever nasty surprise Dracula has put on that particular location. This is the first time I design something, so I would appreciate any constructive feedback on good practices. I've included the OpenSCAD source (which is slightly messy, sorry), so feel free to remix it how ever you wish. BEWARE: the maze-like pattern is not part of the STL or SCAD files. Use your slicer to produce it ("Print Settings -> Infill -> Top/Bottom fill pattern" in PrusaSlicer).