Just a super basic design, meant to hold a single hat but I've been able to reliably hold 2 and sometimes 3 hats

Can hold all styles of baseball hat, flexfit, snapback, velcro, etc.

I use a size small 3m Command Strip to hang up on wall

For printing you can use whatever you want, I typically use 15-20% infill and 3-4 walls but you could probably get away with 10%. You can easily fit a ton of them onto your build plate, for orientation I lay them on its side so it looks like a J from top down.