My bricks are 6 x 2.5 x 1. IIRC they were supposed to be 6 x 3 x 1 but I didn't have big enough material on hand.
I made the molds on my Sherline 2000 CNC out of 1/8“ steel slats. Bug me if you really want details, but basically I'm most likely to add details if I design new mold(s) for the actual desired brick size.
Currently takes me about 30-45 minutes a brick. Secondary mold(s) would speed this up considerably. IIRC I have material to make 4
JM setup using:
Crude g-code generator. Think the mold may also be off by 1/8” or something like that