recently my robo 3d experienced another chip in the bed. nothing fell on it, it just chipped during a print. this is the second one and this one is huge in the q3 section a little smaller than one-fourth of the total area. so I have 2 now one dead in the center about the size of a 50 cent coin and the other bigger than an iPhone plus. I can't get it under warranty because somehow the first one wasn't covered and its past 10 months at the time of the second. last I checked they stopped selling replacement beds. I'm not paying $76 for borosilicate plate. can I use acrylic plexiglass or is that a no-go? can I use a sheet of metal secured to the bed for now? IDK what to do and I'm really frustrated with this damn thing.