Geeetech A20M Marlin firmware (my config) I've upgraded the original printer with: TMC2208 Drivers Nema 17 rubber dumpers Noctua NF-A4x10 FLX fans for GELID Silent 5 fan PC4-M6 connectors PTFE blue tubes Chimera Hotend 2in 2out All metal V6 Useful links:: https://github.com/Geeetech3D/Prusa_I3_3Dprinter https://marlinfw.org/docs/configuration/configuration.html https://marlinfw.org/docs/hardware/tmc_drivers.html https://github.com/MarlinFirmware/Configurations/tree/release-2.1.1/config/examples/Geeetech/A20M