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Comment by wtcactus | Hacker News Reader

This seems the actual future of color 3D printing. Filament manufacturers will develop increasingly better translucent filaments and 3D printer manufacturers will seamlessly integrate the method on the printers.

I have a Bambu P1S with the multi filament upgrade, and while great for several motives (keeping 4 spools at hand dried and ready), I never use it for actual multi material printing due to it’s slowness and wasteness.

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As someone who runs a small business selling niche 3d printed accessories [1] - the ability to perform multicolor printing on the first layer is really important for giving a more finished look (no layer lines). I wonder if this new method would support being able to color the bottom layer (the layer that is in direct contact with the build plate).

[1]: https://pluriboom.com/

This is a really nice idea. I never thought of using it "the other way around". This is nice for tags, for instance - where we live we have this little tag we should put on our mailboxes so that we don't get publicity.

Yeah the AMS is a nice extra but not at all practical for most usecases.

I use it sometimes for badges with text, you only need a few layer changes then which makes it ok. But big multicolour objects nope.

Doesn't Bambu have "Purge to infill" in its Orca fork?

I never did try that. But I'm figuring out it needs a fairly big model (or several copies) to work properly and for the filament change time to be acceptable.

All in all, other than completely changing filament after a specific layer, I don't see the shortcome outweighing the benefits.

But in this case I've mentioned it becomes very handy. For instance, to print a PLA 1st layer for bead adhesion and then print ABS on top of it.

It can help a bit but it's not a magic bullet. You're usually not using that much plastic in infill to do a full purge, and the current implementation doesn't add more infill if there's more purge needed. Toolchangers stand to benefit the most from it since they only need to purge enough to prime the nozzle again.

There's also a side problem I've noticed with purge to infill, it's way less forgiving if your filament has too much colorant or you have your purge amounts wrong. Having a perfect print that had it's colors bleed sucks.

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