ToyREP 3D 打印机

This text appears to be a changelog for a 3D printer project, likely the "ToyREP" mentioned in the document. It details various updates and changes made to the design over time, including: **Hardware:** * **Stepper motor drivers:** Upgraded DRV8825 drivers with 2R2 base resistors for better current control, reducing heat issues. * **Heated bed:** Added a 120x120 mm heated bed and longer support arms. * **Pulley wheel:** Modified pulley wheels to accommodate wider timing belts. * **Stepper motor mounting:** Changed motor mount design to accommodate motors with four mounting holes. * **Extruder gears:** Added two extruder gears for different gear teeth types. * **Motor covers:** Added plastic covers for 28BYJ-48 stepper motors. * **Fan mounts:** Implemented fan mounts above X, Y, and E stepper motors. * **Z axis movement:** Introduced X1 and X2 models using M8 threaded rods for Z motion. * **Power Supply Unit (PSU) case:** Redesigned PSU case to accommodate different sizes. **Software:** * **Firmware setup instructions:** Added detailed instructions on how to configure firmware. * **LED PSU cover:** Included an LED PSU cover design. **Other:** * **Bill of Materials (BoM):** Updated BoM to reflect component changes, including RAMPS 1.4 adjustments. * **Documentation:** Made revisions to documentation and instructions regarding the heated bed, assembly, and overall operation. This changelog effectively summarizes the evolution of the ToyREP project, highlighting key improvements and addressing issues along the way.ToyREP 3D 打印机