u/Meatlesswheat

I keep getting this code. I have a k2 plus with 2 CFS hubs.
I have factory reset the printer, taken apart the hubs, swapped which hub the filament comes from, disconnected the filament detector on the back from power, used canned air in the tubes and it still gives me the error. Before I buy a new filament detector and replace yet another part on this printer, does anyone know how to fix it?

Got the printer used did a few prints and it didn’t turn out like this. The outer walls look solid but the interior looks like this.