Silicone Textured Inflatable Squeeze Bulb
Interesting side product🤪
Upper part: soft and very flexible: Ecoflex 00-30/ Dragon skin
Bottom part: relatively harder: Ecoflex 00-50
Thanks to the online open source. I'm able to download and use those mold models for test.
3d print SLA resin
Bottom hard part: just cut it from a flat surface