A two part silicone mold making from Nuts and Bolts. The challenge here is how much silicone rubber can print those fine threaded details from Nut and Bolt. In result, it did leave some tiny holes(= air bubbles) in the mold where silicone couldn't reach into those fine details. This has to do with the viscosity of the silicone. Another lesson learned...

The Silicone Rubber I used:
Magikmold® T-124 Tin Cure Silicone Rubber
https://www.rawmaterialsuppliers.com/...

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