The K40 laser cutter is quite a bargain (I paid £350 for mine), but you get what you paid for.
K40 BOARD UPGRADE: Not only an ideal replacement motherboard for any OMTech K40 laser engraver, our 24V K40+ control board is packed with cutting-edge
OMTech K40+ Laser Engraver Motherboard Upgrade, Replacement Control Board for CNC CO2 Laser Cutter Engraver Machines with Rotary Axis Autofocus
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Run a K40 Laser Cutter from Your Raspberry Pi with K40 Whisperer –
The highprecision head with reliable performance, and durability, improves the engraving precision and performance. Its stable beams significantly
K40 Upgraded 40W CO2 Engraver 3020 Engraving Cutting Machine LCD Display Digital Cutter Printer with Wheels