These bubble markers in 3 different hights allow you to have your players float around in a bubble on the stand. These STL's are scaled for my 10mm game, but simply print them at 250% for your regular 28-32mm games (I scale those back to 40% to build my world).

They are designed to be a half bubble on a stand to fit your miniature, base-and-all, inside. 

Feel free to edit them and add a top half if that is what you want. On the small scale the tube going down the center stem doesn't hold for me, but should if you scale it up making it print easier as it won't have a suction cup. as-is you are better off making sure they are supported to withstand suction cupping