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: 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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All the cutters I've seen mostly rely on the printer's physical movement to drive the cutting blade, rather than a servo. Technically there's the SnappingTurtle, by the same guy who made the BoxTurtle project, which appears to be closer to what you're looking for, but unfortunately isn't available yet.
That said, maybe take a look at the BoxTurtle project/ discord? Part of the project is the FilamATrix tool head, which is a mechanically activated cutter. There's also the AT4 tool head and the crossbow filament cutter (which you might be able to adapt to your old printer if you didn't want to do a full tool head conversion).