For some reason, Sonoff decided to change the design of their old motion sensor (SNZB-03), which was neat and compact and great for ceilings, but with their new design (SNZB-03P) they decided to add a magnetic mount that adds 30mm of redundant hight, so I decided to omit the magnetic base and dome shaped back cover and design a flat back cover to reduce the sensors hight from 65mm to 39mm.

Print Settings (Feel free to change):

• Layer Height: 0.16
• Supports: Yes
• Wall Loops: 5
• Top Layers: 3
• Bottom Layers: 3
• Infill: 25%

Note: At the beginning, the tolerance might be too tight; use a little force to insert the back cover.