They do make erasable ink. It is used for printing the background on checks and other documents to make it obvious if someone tries to alter them by erasing. I don't know if you can buy it in a ink-jet cartridge though.

I wonder if you could take a laser jet printer and disable the heater for setting the polymer ink, if you would be able to erase the lines like you would graphite.
To test this you could start the print process and before the page printed 1/2 the sheet, cut power and clear the jam. Then try to erase the unprocessed text.

I know the print will smear, but I don't know if it can be erased.

In your print, you probably would set the line density thin and light to minimize the amount erasing required.

If you turn off the heat entirely on a laser printer, the toner will fall right off the paper. At least that what happens with the printers where I work. You might be able to turn the heat down enough to allow it to stick but still be erasable. Of course they're not designed for this, so it would require serious modifications. There's no way I'm going to try this with our printers, but if you try it, tell us what happens!

If you're using Windows, try the Paint program. Copy the drawing to paint, make any changes, save any changes you like, and print. Paint can be used to edit or retouch photos as well. Several of the photoshop programs permit you to create "cartoon" drawings (dark outlines of the subject) that might be useful as well. Good luck with your art.

good idea

I'm only going to say to the comment regarding MS-Paint that FORM and FUNCTION are two entirely different things...

Erasable printing is a pretty good idea. It seems that there are several problems being listed here. A clearer statement of the problem would help.

Or, let me indulge in a sand-like comment: "Why don't you just get a piece of glass, put your original down and another sheet of paper on top of it, shine a light through it all, and do your inking on another page, STUPID? " Sorry, that was immature. (It's called lightboxing, I think, and I know it's a pretty common technique. Of course, it misses the point of the problem he was trying to state, I'm sure, in which case, I did an amazing job imitating him.)

Thanks for the characterization. It's nice to see how I impress people. I try to be rational in my acidity and point out stupidity when it is appropriate. I do have a glass topped table with a small light underneath that I use as a light box but multiple erasable underdrawings would be a lot faster and easier. Please neglect my sarcasm. I sometimes cannot avoid the seduction of being a perfect bastard.