Guard for common household light switch, providing default position and guarding against accidental movement out of default position. Deliberately makes movement from default position difficult, but still possible when desired using finger tip. Movement back to default position is very easy.

Inspired by thing:1703339, but designed from scratch with rounded ends, beveled edges, and more protection in the default position.

Sketchup design file included.

EDIT 5-11-2017: Per request, I uploaded an STL with the horizontal dimension of the opening enlarged by 1.3mm (0.05in). The opening on the standard version is 9.4mm (0.37in), and on the version suffixed with "_wide" it is 10.7mm (0.42in). The _wide version may be useful if your switch is wider, or your printer is over-extruding a bit.