I am just getting started in 3D modeling and design. This is an early attempt just using simple basic geometric shapes to make a bed leveling test.

With any variety of 3D printer, having a uniformly level bed is key. This is a quick and simple print. I've used it on both my X1C and Ender as you can scale the model to any bed size in the slicer. Once printed, you can check the final results with a digital caliper for uniformity. Also gives a good representation of correct extrusion or over/under.

Also made a 9 point version available here - https://makerworld.com/en/models/441990#profileId-347854. 

They serve me well, so enjoy if they're of any use to you!