The Sonoff Basic R3 minimal capsule is a compact and slim design that is ideal for the new Sonoff range. With these dimensions, 72 x 38 x 20 mm (2.83 x 1.5 x 0.78 in) , this product will be able to fit almost anywhere!
The product is available as .stl files, ready to print. If you want to customize anything (text, holes, etc.), the .scad source code is also available. However, remember to download the .scad file for the Parametric box with interlocking lid and place both in the same folder.