Having built a few of these 3D printers already, I'm pretty impressed with the engineering of this big beauty. I'm looking forward to spending more time printing and less time 'fussing around' with the printer itself. Having said that, mine arrived with a ton of scratches on the interior of the door (which wasn't covered by protective film) and a broken z-limit switch... so it's not very pretty, and it doesn't work. - I've already reached out to Robo support on these two points, but haven't heard back yet... has anyone else had any issues out of the box? I can't even find the metal spring that activates the limit switch, but I'm worried it's somewhere in the bottom of the case, ready to short out the Pi or mainboard... I'll keep looking until I'm sure it ain't there.