I'm turning one Printer Epson LX-800 into one b-printer

[PJMDS]

I need to slow down the carriage or all the printer mecanism in order to
use one device that marks points in the paper, the current problem is
the huge speed of the carriage, even in NLQ (450 PPS speed) is to fast,
is there any way to make it slowdown ?

Please help me this is one very important project that only has the speed of the carriage problem, the printer stops with some error when the device
tries to mark the paper, reducing the speed of the carriage will resolve the
problem, this would be great for the blind people to have cheap printer made with old and not used hardware.

Thanks for reading.