I'm working on a tall vase that is actually a box. As I really like the simplicity and results of using Mahoney's Walnut Oil, I finished the vase/box base with it. Oil dries slow, if ever, in boxes/vases/hollowforms.
So I bought a little computer fan, as in it fits in a 1-5/8" recess and the fan itself is 1-1/8" in diameter. $3.50 fan from Adafruit. Old phone charger, shrink tube, dowels and wing nuts/bolts. Osage scrap for base.
https://www.adafruit.com/product/3368