AP Diving Inspiration Vision Rebreather Coaxial Sensor Back Cover

thingiverse

When attaching a 4 or 5 cell holder like [this one](https://www.tecme.de/Inspistuff.htm) to an [AP Diving Inspiration Vision](https://www.apdiving.com/en/rebreathers/which-ccr/) rebreather, coaxial cables connecting to sensors for external monitoring often come without a protective cover to fit onto the back of the cell. I designed this cover with dimensions matching the original (blue) cell cover installed by AP Diving on sensor connectors. I experimented with versions in PETG and TPU. The TPU version is a better fit, and easier to install, but I chose PETG because it's food-safe and doesn't degrade with exposure to moisture. The overhangs are designed to make printing possible without supports if printed with the side towards the sensor up. **Important:** This cover is intended solely to prevent condensation drops from entering the back of the sensor, not to seal it off. As air space at the back of the sensor needs to equalize to ambient pressure, **do not** glue this cover on or make it airtight in any other way. **Update:** After discussing the importance of sufficient ventilation behind the cell, I added a version with an air vent on the side of the SMB connector. Please use this if you print in soft material or are concerned about insufficient ventilation. From Martin Parker / AP Diving: > To check for sufficient gas transfer, take the lid to 1.35 - 1.4 bar using a cell validator and then release the gas quickly from the lid while monitoring the PO2 display. > If one cell is left open and the other cells have new covers, you'll soon notice the difference if there is any. If there's a reaction to pressure drop, you need larger air channels.