\\ you can download the mold design Tutorial online
it takes about 4 hours of 3D printing.
I didn't put it under vacuum machine to to go faster.
The Bottom part is with silicone and fabric (synthetic died fabric with curcuma look like silk)
The Top Part and Bottom part must be glued together with a paper (i try with fabric).
and the tutorial on Thinkgiverse
You can see the video of silicone preparation
I don't have mold release, so i try with a graiss spray … but it doesn't work, there is no air between the 2 parts.
So O decide to put a transparent paper and it's not dry but we can see a air chamber under the silicone.
you can see the video how i made the Flat pneumatic actuator (because i don't have mold release)