This is an infinitely stackable Funko Pop stand provided you have the room. I got the idea for the design from the stackable controller rack (https://www.thingiverse.com/thing:473733). There is a built-in indent to prevent the Funko Pop from moving around. Should fit all standard size Funkos with a stand, and most standard sized Funkos without a stand.
Orient part with the base side down. You can probably get away with printing without supports and rafts are not needed. You need to print (stand level - 1) number of stand supports for each column of every level you want.