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Depending on the printer (CR-10 vs Ender 3) there are some other costs as well. Noctua fan ($14), 12VDC Buck ($10), Extension Cable for Extruder ($10). The prime cost driver is the E3D, with the cheapest legit I could find at $62.99. I think realistically, using cloned gears and legit E3D, one can walk away with the total cost around $120 (which is less than half of the DD Bondtech).