O2ptima EA experiment

thingiverse

This design is experimental and not intended for practical use! I'm developing a refillable alternative to the Extend Air cartridges used by the O2ptima rebreather. Key improvements will be implemented in the next stages... * A groove or indentation must be added at the maximum fill line. * Instead of using an all-thread tube, find a suitable replacement that still accommodates the factory oxygen tube. * Add a gas deflection widget to delay breakthrough at the top of the cartridge. I've introduced a second cap design; see instructions below: Instructions After reviewing this, I decided to revamp the design and display initial prototype images. Components from a Poseidon cartridge are being repurposed for the mesh at the bottom of the unit. The cut-out guide now includes two holes to assist in marking a circle to cut out mesh for both the body and cap. An alternative method is to print a solid disk of the right size with no top or bottom layers, adjust the infill shape and percentage until achieving a satisfactory mesh. The M5 stainless rod is an all-thread type. Cap v2: Revisiting this concept, I'm surprised that rebuilding the entire housing seems unnecessary when there's already a functional one. The solution involves printing two Cap v2s. Insert the threaded rod with bolts on either side of the cap into one unit. Install the assembly into the existing housing from the rebreather with an end cap, fill it with scrubber material, then place the other cap and bolt down before adding the remaining end cap. Using open-cell foam would be beneficial; in case the scrubber settles during the dive, it can adjust accordingly. Pictures of this prototype will follow.