3mm seems excessive for a cigar tube. 1 or 2mm would be fine.
If you only want to make one size I would make it fairly large. Personally I like large ring guages, so it would be nice if the internal diameter was 1" that should fit all but the widest of cigars.
7" is also a good length. I don't own any cigars longer than 7" however the one's I smoke most often and would take with me are 6" or less. Thats just me though, it seems every cigar smoker is different in the sizes they prefer.
Can I ask what the tubes were originally designed for before you decided to also do cigar tubes? Also how much would these cost?
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