Repaired 3rd Level Randomizer

I had trouble printing the 3rd level randomizer, and the one that Jusztin had modified also had problems on my printer. The holes were gone, but the material behind the archways was just too thin... to the point that it was translucent. I opened it in Shapr3D on iPad Pro and added some simple trapezoidal prisms behind each archway, effectively adding more material to the walls. It printed and functioned perfectly with this modification.