Customizable Hole Size Tester

This customizer lets you spit out a very simple object -- a block with holes in it. But that block has been really useful to me, and I hope it's useful to you too.
* Not sure what size hole you need in your design to fit a real-world object? Print out all the plausible-sized holes at once and find out, rather than using trial and error.
* Not sure how much your printer is altering the design size of holes? Print this out, measure the actual size of the holes versus the design size, and find out.
* Adjusting your print settings to try to make small holes more consistent? Print this out and see what effects your settings changes have made.

I've only been designing and printing 3D objects for a couple of weeks, but I've already learned that Small Holes Are A Problem -- especially when that small hole needs to be an exact size. In addition to the normal 3D printing factors that can throw off the size of things, you run into a problem that's unique to printing small circles; when your