Ideas that I never quite got round to completing.
"3D Printed Letter Press"
https://shkspr.mobi/blog/2014/04/3d-printed-letter-press/

I'd love for someone to take this idea and see how feasible it is. I've no clue if the ink would stick to the prints, or if they'd be strong enough to withstand repeated pressings.

@Edent If printed using ABS it should be strong enough providing the model has sufficiently thick lettering. No idea about ink sticking though. I wonder if roughly sanding the letters would give it more stick?
@AverageMarcus good idea. Wonder if you could print the grain in there?
@Edent You totally could but might be difficult to get it small enough to not pool the ink. It depend how big your letters are I guess