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Here's a calibration sheet that I made which makes it easy to level a Makerbot Replicator.
This one also has an affordance (the attached square) to make it easy to keep track of where you are in your measurement in case you get lost, as I always do.
Print it out without a raft, and use your calipers to measure the thickness of each corner. Adjust your leveling screws and reprint until all four corners are the same thickness. Ideally this thickness should be slightly less than your layer thickness value.
Yet another leveling calibration sheet by fluffy is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure fluffy would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!