Still a work in progress.
Runs with a mini 9g servo, works better with the metal ones as those have more torque.
It works, but It needs a little extra tweaking to make it more consistent firing, which is a pain in the butt with the small rubber loom bands. The bands i have are of inconsistent quality and some do stick on and some fire perfect.
I probably need to lower the amount of ammo, and make the step ups slightly taller. It holds up to 12 rounds. I succesfully managed to fire 10 with the metal 9g servo. With the plastic servo i get 8 rounds.
I drilled the holes on the sides with an 1.8mm drill and used glue and pieces of filament to align and hold the model together.