OMTech K40 Smoothieboard Main Board Upgrade for 40W Laser Cutters Engravers &c | eBay
K40 Adaptor Board v2 (kit)
Co2 Laser Rubber Stamp Engraving Machine K40 Lihuiyu M Mother Main Board Control System M2 Nano Engraver Cutter Diy 3020 3040 - Woodworking Machinery Parts - AliExpress
Cloudray M3 Nano Laser Control Card For K40 Laser Machine – Cloudray Laser
Amazon.com: OMTech K40+ Laser Engraver Motherboard Upgrade, Replacement Control Board for CNC CO2 Laser Cutter Engraver Machines with Rotary Axis Autofocus Support, Smoothie Mainboard for LightBurn K40 Engraving : Arts, Crafts &