Here is a snap-on leveling tool that snaps directly on the the carrage of your Makerbot Replicator 2X.
It is similar to others out there like:
einer_designs Thing: 23013
This one I made so when I alter an extruder for repair or maintenance I can re-level them while still on the carrage and not take the bar off or (more dificult for me) use the build plate to level the nozzles.
I have included stl file ready to print and an IGES file soyou can make your own modifications.
Enjoy and let me know of your improvements.
it took some trial and error to make it the right size to simply snap onto my 2X carrage.
I printed and standard resolution, 3 shells, 30% infill, and .23 layer height.