Mix a batch of Ecoflex 0030 or 0050 silicone in a measuring cup. Approx. 20ml/0.6oz is needed to fill one of the molds if they are constructed from 3mm acrylic sheet. Add equal parts of part A and B (by volume or weight) (and silicone colour if using this). Mix by stirring vigorously with a stirring stick for 20-30 seconds
Degas the uncured silicone in a vacuum chamber (optional)
Filling the Mold
Stand mold on a level surface
Fill the mold just to the top with uncured silicone
Allow to stand for 5 minutes
Poke large visible bubbles (e.g. with a bamboo skewer) and refill mold if needed
Curing
Cure the silicone by placing the mold in an oven for 20 minutes at 80°C or leaving it at room temperature for 4 hours
Removing the Cast Part From the Mold
Gently remove the cast part from the mold by lifting one of the ends up and then wiggling the silicone cast by pulling gently from side to side and upwards at the same time