Ultimaker 2 PG35L Direct Drive Extruder for 1.75mm E3D v6 Hotend

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This appears to be a manual for modifying a 3D printer, specifically an Ultimaker2 (UM2) clone, to accommodate the E3D hot end and various cooling fan configurations. Here's a breakdown of the document: **Introduction** * The document outlines changes necessary to upgrade a UM2 printer to use the E3D hot end and other modifications. **Before Running Motor** * Before running the motor, decrease the milliamps (current) on the extruder motor from 1400mA to 600mA. This is done by changing a setting in the Motion Settings of the printer's interface: `[Main Menu] --> [Maintenance] --> [Advanced] --> [Motion Settings] --> [Current E] --> 600ma` **Cooling Fans** * Two types of cooling fans are recommended: + **30mm and 40mm high CFM output fans**: These fans are very loud but can be wired in parallel to the printer's normal 5VDC output. + **Dual 40mm blower fans**: These fans are quieter than the previous type and can be connected to the printer's FAN output. **Firmware Changes** * To enable the cooling fan functionality, several values need to be changed in the `configuration.h` file of the Marlin firmware used by the UM2. * Some notable changes include: + Reducing the MAX positions for the X, Y, and Z axes to accommodate the larger E3D hot end. + Changing the default axis steps per unit (steps/mm) to match the new motor setup. + Enabling the use of the END_OF_PRINT_RETRACTION feature. **Ultimaker Profile or Slicer Changes** * If using Cura or Simplify3D, the retraction settings need to be updated to prevent printing issues. * Retraction distance and speed should be adjusted as necessary. **Additional Changes (Simplify3D only)** * Some starting script lines should be removed from profiles to avoid conflicts with extruder current settings. * Additional script commands may need to be modified to accommodate the changed X-axis range. **Updates** The manual mentions four updates to the design, each addressing specific issues and improvements.