Let's shoot bubbles!

Press the trigger and the gear unit will turn the centrifugal fan.

Print x1 piece of every part except x4 link.

Needed: 

• 6 unit -  M4x12 bolts of any type, I used allen bolts.
• Elastic rubber (use any small rubber that you can find; the one used in brackets, the one used to make pigtails… or just cut some rubber and tie.