well i know there is know current way to sell items so its a little time consuming to get pixels. but if u just buy 100 defence turrets for 1 pixel each and watch everything die u can get about 5k pixels in bout 10 min.
Well you can craft said turrets at the wiring station and they cost way more, not to mention materials, so their cost at the 3D printer is most probably bugged or they shouldn't be there to begin with. P.S. Printed 500 of them, just in case.
Turrets have no "price" so they default to 1 pixel in the 3D Printer. It's a typo in the item file, similar to how the Recreational Vehicle is called a bookcase... and apparently smashes like a pod when attacked. If you look closely, there are countless more typos like this.