Butterworth Design - Prusa Mk3/Mk3S R4 Extruder Mod Filament Path Alignment and Indirect Mk3 Filament Sensor

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It appears that this text is a detailed guide for upgrading and modifying a 3D printing extruder, specifically the Prusa Mk3S. The guide covers various aspects of the upgrade process, including: 1. Replacing the existing filament sensor cartridge with a new one. 2. Trimming the PTFE tube to fit the new extruder heatsink. 3. Installing new parts for the N4 and N4A configurations. 4. Installing an indirect filament sensor configuration for the Mk3 sensor. The guide also includes a list of purchased parts required for the upgrade, as well as a testing status report for the indirect Mk3 sensor configuration. To answer your question, there is no specific text that needs to be highlighted or extracted from this guide. However, I can provide you with some key points and takeaways: * The upgrade process involves replacing various components, including the filament sensor cartridge, PTFE tube, and extruder heatsink. * Trimming the PTFE tube requires careful attention to ensure a proper fit. * Installing new parts for the N4 and N4A configurations may require additional modifications to the printer. * The indirect filament sensor configuration is a hybrid solution that uses the Mk3 filament sensor in conjunction with the Mk3S extruder body. Overall, this guide provides a detailed and comprehensive resource for upgrading and modifying 3D printing extruders.