@Joshua_Herskovic
my molds have removable cores, and the parts that come out typically have a 0.75mm wall thickness. a fair amount of pressure is required to get the somewhat high viscosity silicone into all the nooks and crannies.
I’ll vacuum de-gas the silicone first (in a custom hacked degasser for another post), then pour (and scoop) that into the reservoir cylinder. The piston has an O-ring on it to make a very tight seal into the cylinder. I pull down the lever slowly until I get a good flow coming out if the vents, then I stop up the vents with m2 screws, and hang a heavy weight on the lever to keep it under pressure until it sets. sometimes I’ll use a hairdryer on the mold to acellerate the cure. this pressurized approach produces the best quality part I’ve been able to make thus far.
-C