@Mick Hunter I used 1/8 (3.2mm) with a wall thickness of .03 thou (.76mm).
Works good, maybe your pump isnt up to that? Can you blow through it? you can probably get it to gravity feed too. I have made 4 coils with this dia pump works on all of them.
https://www.aliexpress.com/item/4000...1c674c4dtYpyNP
Watch you dont flatten the thinner wall tubing, try getting it warm when you start bending it.
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