For prusa i3 2020 alu frame, whats your suggestion?

3D Printing
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For prusa i3 2020 alu frame, whats your suggestion?

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@william_foster ​ did exactly what I was going to do. Link to Toms video.

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seriously , toms videos are amazing. Should basically watch them all back to back and then try printing.

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Having tried both definitely direct.

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To answer the rest of the question 3mm seems to be being phased out and 1.75 seems more efficient so I would go 1.75, and I prefer a geared extruder.