My toddler can't quite reach the light switches yet. I designed and printed a simple print that would enable them to turn lights on/off at their level. I use the two original screws from the light switch plate to hold that top part in. The bottom I have designed to be held by a command command strip. It could also be drilled out and screwed to the wall if needed. 

I use viable layer height on all the parts that contain more complex geometry. I use filament (1.75mm) as the hinges. I used a lighter and melted the ends to hold them in place. I slightly undersized the holes and would drill them out with a small bit to make the filament fit. That method was way more consistent than relying directly on the 3D printed holes. 

Hope you enjoy! If you have any questions or requests of changes, let me know! God bless!