Honestly, I don't really have any idea how a laser printer works beyond the basics.

However, someone has invested the time to create an opensource inkjet printer. It's a fair assumption that firstly, they know more about printers and hardware than either of us and secondly, they also know everyone prefers laser printers.

Those two assumptions lead me to the conclusion that there's a significant barrier to producing an opensource laser printer of which you're not aware.

My comment, although unnecessarily douchey, was an allusion to the age old refrain of open source enthusiasts everywhere: if the project isn't good enough for you, fork it and make your own.