1Print out the six 3D parts.
Note: you'll need to print two of the ear bars.
STL files are in the files area and can be used for printing. If you need to edit the design it was made in TinkerCAD, and edit-able files are available here.
2Glue the brass inserts into the clamp, mask, and base
These inserts can be glued in place with 5-minute epoxy. Make sure they dry straight!
3Screw threaded hose barbs into the mask and clamp.
4Assemble the device!
The clamp can be adjusted up and down.