Prusa 3.9.0 for RAMPS 1.4 board

thingiverse

It looks like this is a firmware update guide for a 3D printer, specifically the Prusa i3. The guide outlines changes made to the firmware code and provides tips and recommendations for calibration and usage. Here are some key points from the guide: **Changes to Firmware Code** * Added new files: `pins_Ramps.h` and `Configuration_prusa.h` * Modified pinout mapping for motors in `pins.h` * Corrected pinout mapping for motors to reflect Ramps schematics * Added function to re-calculate steps if using different pulleys * Reconfigured timers and redefined old PWM for bed heating * Added "Init. SD card" menu option to manually initialize SD card **Calibration Tips** * Use Pronterface output to help define correct values for calibration * Modify parameters and values to fit your setup's needs * Use at your own risk! **Initial Wizard Calibration** * Do a full factory reset before making initial wizard calibration * Press and hold control knob, power up printer, release control knob when you hear a beep * Select "All data" option on LCD screen and wait for it to complete **Troubleshooting** * If calibration fails in many retries, edit firmware parameters in calibration sections * Whenever a new upload of firmware is done, repeat factory reset procedure! The guide also includes some additional information, such as: * A link to an Excel spreadsheet that helps with understanding how related equations change when modifying parameters * A YouTube video (https://youtu.be/BbjC9gWVAi0) that likely provides additional guidance and explanations Overall, this guide appears to be a comprehensive resource for users looking to update their firmware and perform calibration on their Prusa i3 3D printer.