Printing Checks Without Magnetic Ink
Yes, an eCheck will still work without MICR ink. Even though the codeline is printed in regular printer toner, your bank is still able to capture an image of the check and send it to the automated clearing house to request funds from the issuing account.
Do I need to use magnetic ink or toner when printing checks?
Magnetic ink for checks is designed to work in tandem with requirements set by the Federal Reserve. The Federal Reserve and all banks require that checks be printed with MICR ink or toner for ease of check processing.
What Is MICR Ink vs. Toner | Source Technologies
Do you need special ink to print your own checks?
The only requirement is that the printer is compatible with the magnetic ink used to print the MICR code. ... Then you can just drop the pre-printed checks into your own printer to add the payee, date, amount, and any memos. With this approach, you don't need to deal with special ink or download the MICR font.
See What You Need Before You Print Your Own Checks - The ...