I did a bit more looking around on tangential cutters and bumped into a couple of things. First, here is a Thingiverse page with models and more information about a tangential cutter for the MPCNC. Second, in that page there is a broken link to a forum page. This is the current link to that topic. I don’t know if he is still monitoring this forum, but you might reach out to @jamesd256 for his Marlin firmware files. Marlin has changed since 2017 when the topic was made, but you would have more of an idea of the changes that need to be made. Also, in scanning the Thingiverse page, it appears that he is using the extruder interface as the 6th axis.
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