A holder for my LED-illuminated hand magnifier. It takes two gridfinity squares. The specific magnifier I use if by UltraOptix. The critical dimensions are its thickness: 15mm, and the diameter of the ring around the lens: 78.3mm. 

I printed it in Kingroon yellow PLA, at 210 degrees Celsius, using a 0.6mm nozzle and 0.4mm layer height.