not ready for printing, have not printed this yet but it should print without supports when finished.

6 inches wide for now or 154 mm not actually sure yet

not sure what hardware or electrodes to use either. its more to get people thinking about building these.

i uploaded stl with better looking eeg with forhead sensors but it seems that its too tall for most printers, its around 9 inches. will try to figure out something for this, maybe bendable sensors like on epoc emotiv.

in the comments section you will find that someone suggested using a plastic bike helmet instead, which sounds awesome to me!