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Best method for dual filament
(midwest.social)
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this post was submitted on 04 Sep 2023
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2 shouldn't have a problem with oozing or cooking since the second filament is not in the hot area.
2 is mixing hotends. What you describe is 3 (y-splitter with the splitting integrated into the heat sink). They suffer basically the same issues like an "external" y-splitter. You can get them to work but changing materials requires you to do all of the painful setup/calibration once more.
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That they don't have oozing issues is correct but I never mentioned this in the first place.
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The main issue with 2 (mixing) is cooking the filament and slicers aren't great at this (operational challenge). There are more pro and cons but I think in the end it boils down to two applications: 1. cheap to integrate. 2. While they are advertised as mixing hotend the result is on pair with dual color/extrusion filament.
No offense, but I made the list and didn't include mixing hot ends.