Doorknob/Big Daddy 3:1 Ogive Nosecone for 5" mailer tubes
thingiverse
This is spec'd for oddball tubes, so not totally useful for everyone, but could be scaled/remixed. 3:1 ogive nosecone, printed in three pieces and then bonded. Includes two separate shoulders with taper to fit into the base of the cone. One is open and would require a bulkhead or other recovery gear attachment solution, the other has cross bracing that you could tie some kevlar/nylon to. I printed these with PETG at 40% infill and they're stout.
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