Alpha Innovations Jaw Jacker

85% infill recommended, printed with ABS. Close model of the one George Matheis (Modern Combatives System) designed for Alpha Innovations, only I optimized it a bit for 3D printing namely a tad thicker webs and a better palm swell for those with less meaty hands. FWIW plastic knuckles are LEGAL in Canada (where I reside) as per this CBSA document (it is YOUR responsibility to confirm legality in your country of residence, I cannot be held responsible): http://www.cbsa-asfc.gc.ca/publications/