It’s easy to make clean resin castings when you have a perfect silicone rubber mold.
This video is part 2 of this earlier video:
   • Silicone Mold Making: When To Use A T...  

SKIP AHEAD TO THE GOOD PARTS:

00:00 Casting a resin part in a 2-part silicone rubber mold.
00:21 Orienting the mold in space so that it will fill properly.
00:58 Why not inject the resin into the mold?
03:12 Trimming the mold to avoid slight deformation by the mold case.
04:19 Building the mold cradle.
06:22 Cutting the cradle parts on the tablesaw.
08:32 Some bandsaw cuts and assembling the cradle.
10:21 Fitting the rubber bands.
11:50 Trimming the rubber mold so that it fits easily into the pressure pot.
14:55 How much resin will I need to make the casting? Weighing the model.
16:00 Weighing out the urethane resin. Mixing the A and B sides.
18:21 Pouring the resin into the mold.
18:53 Dropping the mold into the pressure pot.
19:55 Taking the mold out of the tank. A little bit spilled but it’s OK.
21:00 Remember, you can check your witness cup to see if the resin is cured.
21:13 Time to open the mold.
21:57 A slight problem: I failed to cut completely through the rubber bridge in the spout.
23:00 Problem solved; the casting comes out and it’s perfect!
24:29 Trimming the sprue and vent on the bandsaw.
25:14 It’s easy if you trim your sprues immediately after the parties demolded.
25:53 Very little flash for a 2-piece mold. Super clean parting lines!
26:15 Great result, I couldn’t be happier! Thanks for watching!