Thanks everyone! I feel much more informed, but I'm still not sure I'm any closer to making a decision! I thought the S5 would be more reliable, but feedback seems to indicate both are reliable machines. I would be more inclined towards the UM3, but now I feel I've underestimated the potential of the large build volume and the filament sensor. I watched review vids for the S5 I had to pick my jaw off the floor after seeing builds utilizing the space. @kmanstudios @Carla_Birch Where/When does the print pause when the sensor detects the end of a filament spool? Is it as soon as the end reaches the sensor? I imagine you could then load a new spool melt the ends together and resume the print? @Shadowman I know the power brick is gone on the S5, but is now installed beneath the printer itself, correct? Does this add to the stability/weight of the printer? Does stability even matter? I have a printer on a heavy desk, but still get some vibrations. Is this even an issue to consider?