Ender 3 Simple Bed Level Fix

Reddit user [hoges](https://www.reddit.com/user/hoges) posted an interesting thread in the [Ender 3](http://ender3.reddit.com) subreddit about a fix for an issue that he'd discovered in troubleshooting difficulties with bed leveling.

> I discovered a couple of days ago that the eccentric nuts and the spacers which are used on the XY carriage are ~0.5mm different in height. That means that the carriage will be on an angle from the outset and need to be compensated with the springs.
>
> Thi