Bullet puller

DISCLAIMER: reloading cartridges is a dangerous endeavour.
All reloading and firing of reloaded ammunition is done at your own risk.

Do not attempt to reload until you have read and understood at least one printed reloading manual.
Always wear safety glasses when reloading.
Do not smoke while reloading.
Keep primers and powder away from heat and open flames.
Keep primers and powder where they cannot be accessed by children.
Work up your loads following the standard procedures described in printed load manuals.

To repeat, all reloading and firing of reloaded ammunition is done at your own risk, the author of the "Thing" (Bullet_puller_head.stl and insert9mm.small.stl, insert.357magnum.small.stl, insert10mm.small.stl, insert.45ACP.small.stl , insert9mm.stl, insert.357magnum.stl, insert10mml.stl, insert.45ACP.stl and all contents of the webpage "http://www.thingiverse.com/thing:1502793") assume no liability and no responsibility for death, injuries, or damage due to the use of said "Thing".

A bullet pullet is an inertial device capable of removing a bullet from a brass case.

To build your own you will need a 3D printer, a 10 mm round stick and some glue to fix the stick in.

I wasn't able to make an insert that would "fit most sizes" so each caliber has its own shell holder.

To load a cartridge push it bottom first into the low end of the insert until you hear a click. Push it towards the same direction to remove it.

Twist clockwise to lock the insert in position.

ERRATA CORRIGE: The "top heavy" insert design was too fragile, at least in PLA. I've posted smaller, more robust inserts.
ADDENDUM: Turns out the former design works fine, I just set too high a layer height.
ADDENDUM #2: I've added another set of inserts. These are less fancy, but a lot sturdier than the previous ones. They should last longer, as the tines no longer bend to accommodate another casing. BTW, I've renamed the 10 auto, calling it ".40". I've also added four inserts, .22 Hornet, .223,.308 and .44 Remington Magnum.
Finally, I've added another head with deeper seating for the handle and more space for the cartridges.