Pretty simple, looks really neat. I did this in Tinkercad and sliced with Lychee. I printed with supports, you may be able to without, I haven't tried. Took a while to print, difficult to remove supports. Looks pretty neat. I fit all of my business cards in it, 50 3.5 x 2" (88.9 x 50.8mm) in it with a bit of extra space left. Easy to resize