3d Printed 510 Cartridge and Battery Pen Holder
This has 8 spaces around the center for 510 cartridges and two spaces in the middle that are 65mm deep to hold the battery portion of your pens. It is also textured to make gripping it easier. 
Makes storing cartridges much easier and keeps them in an upright position to ensure the heating element of the cartridge stays saturated in the cartridge oil. This print has triple wall support and is a very sturdy plastic object. Empty cartridge and battery not included.
 
Item measurements are below:
3.2 inches wide x 4.3 inches tall