Ik at a loss how odoo handles printing. 

I have an odoo 10 docker image running with point of sale and a posbox. They seem quite happy with each other, printers are being recognized on the posbox etc. Products assigned to printers. But nothing at all. No errors in the webinterface or even error messages in logfiles. Zip.

So I do not know where to start looking into about what I am missing

I am happy to supply details about the setup. But it is all standard and setup as explained in the manual(s). 

Any help whatsoever would be _very_ welcome.