Cnc Engraving Machine Control Board 3 Axes for Grbl 1.1F V3.4 Usb Diy Small Engraver Controller Offline engineering: GRBL1.1f firmware is adopted, with stable performance. Optional offline module to realize offline tool setting and engraving. Directly enter the picture for engraving, without programming and design, simple and convenient Adjustable power: PWM or TTL signal control is supported, and the power is adjustable between 0-100%. The spindle supports 0-100% adjustable PWM power. Enhanced spindle drive can support 20000rpm spindle Stable overcurrent protection: provide overcurrent protection for stepper motor to avoid damage, upgrade integrated stepper motor drive, 2A high current, high stability. Add power button switch Good heat dissipation: professional shell protection, fan active heat dissipation, will not heat for a long time. Add fan ports to force cooling, add enclosures to protect the control panel during transportation and avoid short circuit problems during use Short circuit protection function: cancel the drive module, use the integrated imported stepper motor to drive, with short circuit protection, integrated heat dissipation aluminum alloy Colour:black Material:pcb Package Contents: 1 x CNC Control Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.