I've been making items for my multiboard and felt really constricted to have to print the snap connectors (or push connectors) touching the build plate surface. So, I set out to make a snap connector that fits very tightly, and can be printed on any vertical surface (this does not print well horizontally because the layer lines are too weak in that orientation).

As noted above, this fits very tightly, so if you use it, I recommend printing the test print first to determine if you want to size it down for your purposes.