Filament Guide for the printrbot Simple Metal (Slightly Modified)

**Update (9/7/16):** I uploaded a new version with (what should be) better guide alignment. The last one was a little off on my 1403. I haven't printed it yet, so I could be wrong. Someone let me know if you print it.

I made a few modifications to the original model by dasistdaniel, but it works just the same.