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Hi I've successfully printed your design here in ABS -- slight deformation in it due to curling of ABS but I don't think it's substantial enough to have to print another..

I am wanting to build a new extruder head with this 1.75 body and .3mm hex hot end so I can easily change out my 3.00 body and .5mm hex hot end extruder head so I can easily switch back and forth from 1.75mm filament and 3.00mm filament...

So far I've only printed the taller extruder body and the idler arm. Do I have to also print the latch and spacer? Is it required for this set up? I'm looking at these parts and don't understand where they fit in the equation.

Do you have step by step instructions for building a 1.75 extruder head or is there a resource out there that exist? I need to understand what other hardware I need other than the m3 50mm bolt for example.