Print Bitmap does not print text

Hi,

I am trying to print the receipt bitmap available in https://github.com/poynt/PoyntSamples.

What I get is that the printer tries to print, but I get a white paper with some black dots.

I also tried other bitmaps and they print only “big things” like logos but do not print text.

It looks like the text is too “thin” to be printer.

Thank you all