This is a mountable enclosure for a toggle switch.  It was specifically designed for the Gardner Bender GSW-121, however it should work for any similar toggle switch. 

• Removable cover attaches with four m3 screws and has slots for four m3 square nuts. 
• Two mounting holes on the back
• 10mm hole on the bottom, easily fits through heatshrink female spade connectors
• Recommend printing the body with supports enabled and the front of the body face down (rear mounting holes should be pointing up).  You may need to put some support blockers around the screw holes, but I managed to clean mine out with a dental scraper tool.