This is an avionics bay for a 3 inch minimum diameter rocket. Due to space limitations in a 3 inch rocket the traditional sled design does not give enough room for two altimeters and batteries along with connectors for ejection charges. The bay is set up for a Featherweight Raven and PerfectFlite Stratologger, both running off 9V batteries, which are contained in the battery compartment. Compartments and altimeters are mounted with brass threaded inserts from McMaster-Carr.
The AV bay is assembled using three 10-24 allthreads with thread connectors at each end. Hex head screws (large enough to seal against ejection charge blowthrough) are used to attach the bulkhead to the AV bay internals with ejection connectors. The bulkhead also includes a 3D printed block for some typical phoenix connectors to serve as terminal blocks to save space from the normal bulky screw-down connectors.
This bay flew on my rocket (Sixieme) at BALLS 2016 with no damage through a 19G launch to 23,000 feet and recovery. Maximum speed was 1.8 mach.
Also included is a drill guide for the bulkhead for bay and ejection block alignment.
Insertion into the carbon fiber coupler tube is using guides on an inner ring that retains nuts for outside screws to attach body tubes to AV bay.
Supports recommended to keep battery bay and mounting cutouts clear. You can print without them, but the possible structural loss is not worth the risk.