I have several 3D printers, and I’ve always been satisfied with using either Repetier or Marlin on all of them. There are a few other firmware versions that could run on my hardware, but those ...

My Ender 3 S1 Pro came with the Marlin firmware out of the box. While it works just fine, Klipper is a much more sophisticated 3D printer firmware. While you can use an SD card to flash Klipper ...