I needed and ashtray that would keep my area clean and organized. I have design this ashtray for vape pens with dry herb attachments in mind. It can hold up to four 20mm radius batteries. It has twelve wholes that keep tools like small brushes, and dabbers, etc. The slots on the side can keep screens and lighters if you print it with ninjaflex. Ninjaflex is preffer for the ball in the center of the ashtray with a 5-10% infill for a soft impact when tapping off the ashes from glass bowls and other smoking accesorries.