We were unable to find a printer on the market that prints a 9-part form. The
closest we found was one manufactured by Toshiba that prints up to 6-part
forms.
The problems encountered with 9-part forms concern the print head. To put
enough power behind the pins of a dot matrix to print on the ninth part of the
form, the pins will penetrate the first and probably the second part of the
form, leaving holes. Also, the pins often get caught in the form as it moves
and are bent and the print head needs to be replaced. Unfortunately, printers
designed for microcomputer use just aren't up to the task of printing 9-part
forms.
Daisy-wheel printers have similar problems. The energy demanded to print
through nine layers would break a plastic print wheel and bend metal print
wheels out of shape.
Even heavy-duty Printronix line printers are rated only to 6-part forms.
We suggest that you contact the paper company that makes the 9-part forms and
ask what printers they recommend for use with these forms.