Magnetopult Mark III (Magnetic Catapult Game)

Grab a pile of Rocks and battle your opponent using a magnetic repulsion driven catapult.  The magnetopult consists of three parts that can all be printed without supports. The base, throwing arm and the cross bar.  Each can be loaded with up to three magnets.  This is remix of an previous model I design, modified to use larger 15mm x 3mm magnets from amazon (TRYMAG 50Pcs Super Strong Neodymium Magnets)

The magnets in the base should be loaded to repel the magnets in the throwing arm and the crossbar can be set up to either attract or repel.  For me they fit perfectly, I have to force them in but there is lots of friction to hold them in.  To test that your tolerances work I suggest printing the cross bar to test the fit and then you can scale if you need to. 

With the full 9 magnets I can easily throw a Rock 8 to 10 feet.  You can play with the trajectory by changing the number of magnets as well as the position and direction of the cross bar.  

The flop targets have a skull and crossbones on the bottom of them to indicate a downed target (pretty obvious anyway, but I thought it was a fun touch.) you can download them from the original model. (https://www.printables.com/model/443966-magnetopult-magnetic-catapult-game)

You can throw anything you can stick in the catapult bucket, but I thought some Rocks would be appropriate. (Slightly trimmed version of masoncfrancis's the Rock's Head)