Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3471005.

These are some test prints I made to help level my bed while it's printing. They are currently made to fit a 225mm x 145mm bed, which would cover the MakerBot Replicator Dual, FlashForge Creator Pro, PowerSpec Pro 3D, etc. It helps to see if things are laying down properly, if it's more squished on one side or corner, and to make necessary adjustments.

I have added 3 new patterns and included my original Concentric Bed Rectangle print to keep it all together. All lines are .4mm wide.

Edit: I've added a spacing torture test, both a full plate as well as a single width strip for both X and Y. The spaces go from .1 - 1mm in .05mm increments (.1, .15, .2, .25, etc). After 1mm, it increases up to 2.5mm by .1mm increments (1, 1.1, 1.2, etc).