The E3D install seems to have gone fine, but a few other seemingly unrelated problems since I did it are keeping me from printing. I am not sure if they're related to one another, and I'm stumped and, again, frustrated.
1) The heating bed slowdown reported above. It does eventually get to the mid-80s, but it takes so long. Nothing has changed that I can see, unless the firmware did it, or unless the extruder heater draws so much current that there's not as much left for the bed? But the bed takes longer even with the extruder heater turned off.
2) Not a problem so much as an annoyance: the tendency of the LED lights inside the case to flicker seems to have increased. I mean, a lot; it gives me a headache to be in the room with it. Does this, combined with #1 above, suggest that my power supply is now inadequate -- either because of the heater drawing more, or just its own general decline?
3) It seems that the X and Y home/park location is in some way "out of synch". The locations shown in RH don't necessarily correspond to actual locations, and the manual controls won't work. If I try to make it move the wrong way, it'll grind up against the limit switch, but RH updates its location and now it can move. However, the X, Y, or all-axis Home buttons just recreate the problem, as does starting the print job (the print head is already in the far back right, but it acts like it's trying to move more that way when I start the job, making a grind noise, then it starts printing properly). I've had this before when I've had the power off and moved the head around, but I was never sure what cleared it. (Powering the printer off and back on, disconnecting, etc. doesn't do it.) This seems like a very simple thing I should know by now, but I can't figure out what to search on, or even how to describe it.
4) The one that actually keeps killing my print jobs, which may be related to #3: I keep having a Y offset on the second or third layer where the whole thing starts printing about 10mm farther towards the back of the printer. I've had the same print job do this by the same distance at the same time into the job three times now. I don't see any way it can be the print head getting stuck anywhere, though I haven't been able to catch it happening to see the moment. I wonder if it's related to #3 because there's a grind noise just before it, like when the head moves to the limit and then can't move past it but RH thinks it is still moving.
During the E3D install, I did not knowingly change anything related to any of this stuff!