This is a remix/combination of Hat Cap hanger hook by c0t0s and Pegboard Click Hook for the Multiboard system.

This lets you hang and display a baseball style cap (that has the little button on top) on a multiboard. I recommend the standard multiboard print parameters (mainly, 3 wall loops). The original multiboard click hook does not require supports, so when printed with supports, the diameter is a bit larger, resulting in a very tight fit. It will go in though! (I did need some leverage from a screwdriver to remove and reposition them.) You might try scaling down to 99% or 98% if you're not comfortable with how tight the fit is. I haven't tested that though.