Apologies, I have now downloaded new drivers for the third time and VOILA 12x12 is now an option. I don't know what changed but I am so happy it did. I will say that the download page looked a little different this time, so maybe I had a clone downlo...
I am having the same issue, there is simply no option for 12x12 paper. I bought this printer for this option only and it worked great on my old Win 10 cpu (which bit the dust). I am seeing all kinds of 'suggestions' which assume there is someplace to...