Okay, this is not quite done, but I thought I'd throw it out there anyway.
This version is less prone to cracking. Instead of a washer and nut, there is an M6 tapped hole in a piece of aluminum. But best of all, two can be bolted together to form a dual head extruder. Yes, you can have one or two of the same extruder! I'm working on a mount for this right now.
We're sure charlespax would love to see what you've printed.
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