RevD of the cover is current.
OpenSCAD 3D printed cover for the HM133 DTMF Adapter. See https://www.openscad.org/ to download OpenSCAD and access toutorials and instruction manuals.
See https://ke0ff.github.io/hm133/index.html for project description.
This 3D print is 1/2 of the cover. Print two identical parts and mate them together to get a complete cover. Added #1 screw holes to allow the clamshells to be actively secured.