BTT
BigTreeTech (BTT) manufactures control boards, touch screens, stepper drivers, and other electronics for 3D printers.
Their product line includes the Octopus and SKR control boards, TFT touch screens, TMC stepper drivers, CB1/CB2 compute modules, and USB / CAN bus toolhead boards. BTT products feature Klipper compatibility and are widely used in Voron builds, Creality upgrades, and custom DIY printers.