This. 3D printing is a trendy fashion, 2D is boring.

I'm sure the community has enough intellectual ability to create, if not a full printer, at least replacement firmware for existing ones. There just doesn't seem to be much motivation to do so.

If you're willing to waste a stupid amount of plastic you can 3D print a stamp and stamp your letter. You could do multi-color printing if you used a paintbrush instead of a roller to apply the ink.