V1 is a stand to fit 510 connector atomizers up to 22mm in diameter. V2 is flat on the top to fit atomizers larger than that. Images show the V1 with a Delta 2 and a Troll V2 in them printed in white PLA at .3mm layer height. I've included the Fusion360 files as well as the .stl files so that you can tune them if you desire to fit your own atomizers.