Also (probably) a nozzle, teflon tube, peek, brass tube all made for 1.75mm filament.
The simplest/most effective way to switch would probably be to purchase an E3D hotend that's made for 1.75 filament, and have two print heads that you switch between when you want to print in different filament diameter - assembly of the stock UM printhead is a pain in the ass, because the tightness of the thumbscrews affects the nozzle location so much, and the wire routing is challenging.
I suspect in this setup, you could probably keep the 3.0mm bowden tube.
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alex-marakesch 0
You need another bowden tube, smaller diameter - 2mm.
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