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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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It's an extruder, ie. the part doing the pushing on the filament. Having it close to the hotend has some advantages. If you printer already has the extruder on the print head, this mod does not make sense. If it is mounted on the side of the X-axis, it might be worth it.
I'd nevertheless first get used to your printer as is until you discover the weaknesses that you want to fix.