Chris_KZ aka dezcompiler published his two-part design of a 3D printed mold for 65% mechanical keyboards that can be used to create a silicone dampener that goes between the PCB and the plate.
Created a 3D printable mold that can be used to make silicon PCB dampener for 65% keyboards – dezcompiler.
The mold is split into two parts so it can be printed in the author's Ender 3. The mating edges of the two parts might require some cleanup. Tape the bottom of the seam with packing tape to prevent the silicon from leaking out. It also helps to tape the mold to a hard surface.
Chris used double sided tape and some MDF, and about 40g silicone.
The mold does not need much silicone (I think it took around 40g all together). I used a basting syringe to get the silicon into the mold. This helped to get the silicone in all the small spaces – dezcompiler.