Canning Jar 4-way adapter

Yet another multi-canning-jar thing! I had 2x and 6x so why not add 4x! The fit is a little sloppy; might fix that later. Or you could try scaling it down to 99 percent. If you get it too tight, put a jar in the oven for a while and then slowly/carefully screw it in with a hot-pad.

Consider using a brim. Baked-in bridging supports for the inside top need to be trimmed off after printing, especially on the threads. No supports needed if your printer can do 70 degree overhangs.