[detaro]

Yeah. printing on a single hand-fed sheet: probably "easy". Reliably going through a random pack of 500 pages, not so much.

Something pen-plotters don't do (they typically want paper to be placed down for them, or work of a roll of paper), and the maybe 3D-printer equivalent of preparing the print bed and removing prints from it is a well-known source of problems and manual work.

[InitialLastName]

I think that's a key point you've made, which is that open-source 3D printers don't do the part that would make them useful for scale production (transitioning the work pieces off the print surface and preparing for the next run).

Nobody would accept a 2D printer that took manual intervention every sheet.