Originally Posted by
hvfrancesco
actually I had to go with sub-optimal materials as I was not able to find a thin enough light-proof fabric for the exterior.
It's a 3 layers sandwich. The external layer is just spray-painted paper (two black coats and a blue one), more or less 120gr, I've made the middle layer ribs out of 185gr laser cut thin cardboard and the internal layer is black thin cotton, not completely opaque by itself, but it seems to work. Had to reduce by almost 3 cm the maximum extension of the original bellows in order to keep the closed pack thin enough.
It's probably not going to last decades, but it seems to work.
The original bellows is really light and thin, apparently just two layers. I wouldn't be able to replicate it myself.
Made the bellows design in cad, apart from the maximum extension all other dimensions replicate exactly the original bellows.
I can share the design of the ribs if someone is interested.
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