I was printing 4 identical parts just now, the first of which was on the front left side of the print bed. The 2nd part started printing (rear right side) and I decided to pause it and pop the first one off so I could check it out. Well apparently the printer forgot that it had just printed something right there and it rammed the hotend right into the part that had just finished printing. Clearly there's some logic missing in the firmware to tell it how high the head needs to be to avoid hitting anything, or it just needs to lower the bed all the way when you pause.