crowdfunding open printer, can it become a free software device?

https://www.crowdsupply.com/open-tools/open-printer
It says the printer will use a raspberry pi zero w and have wifi 802.11ac support, maybe it is the wifi which the raspberry pi in question comes with. A raspberry pi zero w and wifi 802.11ac requires non free software in order to work. So the question is if the open printer has such a level of modularity that you can swap the raspberry pi zero w computer with a free software computer? Can you name suitable candidates?
Thank you.