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Add dual extrusion to your current 3D printer - dual switching extruder guide - YouTube
Cost-Effective Independent Dual Extruders Direct Drive 3D Printer: JGMAKER Artist-D Launch at Kickstarter - 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing
Double extruder for 3d printer: Zen Extruder
Sovol SV04 IDEX 3D Printer, Independent Dual Extruder 3D Printer with All Metal Direct Drive 32-bit Silent Motherboard Auto Leveling, Larger Build Volume 300 x 300 x 400mm: Amazon.com: Industrial & Scientific
Best Dual Extruder 3D Printers and Their Benefits | Top 3D Shop