To begin, mix both commercial silicone mold material components in a mixing cup, maintaining a one-to-one weight ratio. Stir thoroughly with a disposable spoon for about five minutes until the mixture becomes uniform in appearance. Then position the 3D-printed mold plate fitted with packing tape over a sheet of paper.
Pour the silicone mixture into each stopper hole, ensuring all the holes are filled. Using a rubber squeegee, spread the silicone evenly into each stopper hole before clearing any leftover silicone. Leave the rubber stoppers to dry for four hours.
Once the stoppers have fully cured as indicated by the complete drying and hardening of the silicone mixture, take off the tape from the back of the mold plate and pull the stoppers out of the mold. Finally, clean any surplus silicone attached to the stoppers.
