I followed your link, but because the language is not in english I am unclear about what the potential applications are of this process.
What are the applications?
Are you extruding live bacteria within the plastic or is it getting killed by the heat?
Just seen this post - it's something quite different to normal printing.
I guess the hardest part is to get viable bacteria through the print head without them being killed off by the heat. Search for the lowest temperature plastic available and print really quickly to minimise the time in the heated nozzle.
A cold print bed would help.
You may find that bacteria in their dormant state are more robust
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