Dondolo Rework v2

thingiverse

It appears that you've provided a detailed guide on how to build a dual extruder 3D printer using the Marlin firmware. The guide covers the mechanical, electrical, and firmware aspects of the project. To make this information more accessible, I'll break it down into sections: **Mechanical Parts** * Printed parts: + X Carriage + Backplate + Pendulum + Idler Left + Idler Right + Idler Pivot Left + Idler Pivot Right + Front Bar + Pendulum Clamp + Fan Duct + Fan Duct Mount + Servo Horn (with teeth) + Stepper Shaft Spacer * Mechanical parts: + 1x 694ZZ, 4x11x4 bearing + 2x 624ZZ, 4x13x5 bearings for idlers + 1x F695ZZ, 5x13x15x4x1 bearing + 1x MK8 filament drive gear + 1x traction spring / paper clip spring / peg spring / some rubber bands **Electrical Parts** * Mini servo HS-225 BB or HS-225 MG (BB is used in this guide) * NEMA17 stepper motor (34mm thick, 17HS3401) * 5V DC-DC converter to power the servo * Axial fan 40x40mm, 12V **Screws and Nuts** * M2x8mm screw * M2 nut * 2x metal or nylon spacing screw M3x15mm (to mount the fan) * ...M3 screws, nuts, and spacers... **Magnets NdFeB** * 4x 10x5x2mm block (1.3kg) * 5x 8x3mm disc (1.3kg) (only 3 are used in this guide) **Hotends** * 2x DyzEND-X hotend by Dyze Design **Other Parts** * PTFE tube OD 4mm, ID 2mm - for leading the filament into the hotend * Metal or aluminum plate to cut and form the filament oozing shields * Cotton hotend heat insulator - for oozing shields * Capton tape - for oozing shields * Iron nail of 4mm diameter - used as a shaft for both idler bearings **Tools Used** * Modelers knife * Dremel tool or other drilling machine * Drills of 2.5mm and 3mm diameter **Firmware** The guide uses Marlin-1.1.x with minor modifications. The following changes are made to the firmware: * Uncomment/update definitions in Configuration.h to enable switching extruder and nozzle features. * Modify Marlin_main.cpp file to disable servo when not used and z-hop during hotend switching. This is a comprehensive guide on building a dual extruder 3D printer using Marlin firmware.