Wanted to test this type of dampener so I designed one that is very similar to the Astrosyn. Print the motor and mounting plates from a hard material and print the dampener out of something flexible. You can adjust settings on the dampener like perimeters and infill to change the dampening effect. Glue together after parts are finished, I used a stepper to make sure all the holes were aligned. First tried contact cement but had to redo it and super glue ended up working better. Total dampener should be 6mm thick when assembled.