MakerHawk 6pcs Optical Endstop with 1M Cable Optical Switch Sensor Photoelectric Light Control Optical Limit Switch Module for 3D Printer: Amazon.com: Industrial & Scientific
Startnow Momentary Micro Limit Switch Cmv103D Ue220V 0.3A with Long Handle Open Limit Sensor for CO2 Laser Engraving Cutting CNC Machine - China Limit Switch, Micro Limit Switch | Made-in-China.com
Proximity Limit Sensor Switch (C2) - LightObject | Professional Laser Cutters and Engravers Solutions
NEW MICRO SWITCH FE7B-FDRD6-M SENSOR FE7BFDRD6M | eBay