So, now the very first mold is ready to be filled with plastic. Two CNC machined halves out of "Renshape" (polyurethane tooling board), clamped together by aluminum plates. 

The mold is for a 35mm pipe mount, but is mostly an experiment since I will try to make the product in cast aluminum instead. But I might perhaps make a cheaper plastic version for those who sometimes just wants to play around with an inexpensive antenna rotator and don't need one mounted outside.

I deliberately made parts of the negative mold quite thick, up to around 6mm. This is to see how both the mold behaves (will it get filled completely?) and will the plastic retain its form or will it sink together when it cools off. Time will tell. 

At the moment I have treated the parts with a spray-on wax release agent that needs to dry before I can fire up the injection molding machine.