BryanNauer_BreathingMask_Spacer Blender DRAFT

Original idea by Bryan Nauer (on fb's group "3D Printing Useful Things!")

(no versionning, quick and dirty draft)
BryanNauer_BreathingMask_Spacer.blend

in blender

(you can also use the 3D-print plugin which is very good to check the meshes for non-manifold faces, holes, etc.)