Carbon fiber magnetic ball joint jig for the Cerberus, Cerberus Pup, and other Rostocks

This jig is used to make consistent length magnetic ball joint arms for the Cerberus, [Cerberus Pup](https://github.com/grabercars/Cerberus_Pup_170_GT2_belt_drive), and other Rostock deltabot printers.

Requirements:

1. 3/8" steel ball bearings

2. 3/8" x 3/8" cylindrical neodymium magnets

3. Carbon fiber shafts, such as arrow shafts

4. High-strength glue capable of bonding metal to carbon fiber (I used Loctite Metal / Concrete epoxy, others have used JB Weld)

Print two and moun