Two years later. I got a Replicator+ for Christmas and I am having the exact same problems as @Duck_9. The extruded first line on the edge is fine but the plate dips in the middle and so the print is in the air and doesn’t adhere.
The build plate I received was not level. I had to downgrade the firmware to 2.5.0 because they removed the build leveling procedure in subsequent firmware. It seems that leveling is not enough because the build plate dips in the middle.
Turning off the raft is not a problem. The MakerBot Print Software lets you turn it off under Printer Settings.
I object to people saying that printing with rafts is fine and even preferable. Printing with a raft leaves a residue that is almost impossible to remove. Tweaking the vertical offsets help a little but still leave an ugly and rough base layer when removed. I should be able to print to the plate directly on a $2800 printer. I’ve seen <$200 printers print perfectly without rafts. The bottom of the print should be nice and smooth. Not rough and bumpy.
I have even observed the first layer above the raft and it still fails. The lines are not sharp and don’t adhere properly. It’s weird. It prints the raft perfectly but then fails to print the first layer of the model properly.
I’ve tried a second build plate but had the exact same issue.
I’ve tried blue tape with no difference. I’ve tried hair spray with no difference.
I was able to mitigate this problem by moving the model to the near edge but that is just a workaround. It printed a 3D Benchy’s first layer fine but eventually fails at 70% when the whole thing comes off the base.
I think MakerBot should fix their build plates so they are level. They made a big mistake with this product. It is not acceptable that a model can’t be printed without a raft. Their official stance when I contacted customer support is that they don’t recommend printing without a raft or Brim + Padded base. Note that a Padded Base is a permanent addition to the structure that does not detach and will ruin a design that has to move freely (like a fidget cube or anything with articulated joints)