- print the STL files in original size

- mix silicone (each color 5ml) and color as specified by the manufacturer

- cast the silicone in the mold (if needed with a syringe)

- only a few ml's silicone are need, if you let a small layer above the mold you can pull out all at once  and cut the shells of the layer

- to get the silicone in the realy small slot you can use a 20gauge canula and/or vibration

- glue the hook and loop/magnets in the middle at the bases downside