Since I've been studying a2 printer cards, I came across this article about a guy who decided to make his own printer card, it's a fun read:

My tipping point came the day I decided to add a printer. I saved up $1,000 and headed down to the local Apple store in Santa Barbara to buy a Paper Tiger dot matrix printer along with the add-on board to connect it to the computer.

Damn. They wanted $185 for that stupid little board; nearly one quarter of the price of the printer itself. And believe me, I had spent enough time at Radio Shack to know there wasn’t much more than a few dollars worth of parts on it.

It was right then I decided I’d design and sell a competing card.