Thermal printer to Lego Spike and inventor

I'm starting posts again after few year break. This post is about connecting thermal printer to new lego mindstorms series.

First of all i printed my own connector

I will make another post about connector
Printer has i't own 9 volt battery, because i don't know if lego can provide enough current for printer.
Then i connected ground and data lines to printers serial port.
Code is simple in python

Printer i used was this Link to Aliexpress