3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: !functionalprint@kbin.social or !functionalprint@fedia.io
There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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No Ads / Spamming / Guerrilla Marketing
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Do not create links to reddit
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If you see an issue please flag it
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No guns
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No injury gore posts
If you need an easy way to host pictures, https://catbox.moe/ may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
Moderation policy: Light, mostly invisible
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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.