This modification replace the printhead of the Anycub Vyper. It is optimized for klipper firmware, but compatible for a firmware. The advantages of this extended mainboard are: Increase performances up to 130%; Increase printing to 150%; No nozzle cleaning before leveling;Faster leveling possible; Connector for various probes;for BL-Touch/3D-Touch, klicky, pinda, etc. Connector for RGBW . Note: With the current holder you lose some build space; ; The firmware must be modify;You can not use the led and the level. Colour:Black Material:PCB+Plastic+Metal Package Contents: 1x Vyper Stealthburner Adapter Board(AB Version) 1x Accessory Kit 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.