Sailrite-Compatible Magnetic Sewing Guide

### Sailrite-Compatible Magnetic Sewing Guide
Author: Donald L. Merand for [Explo](http://www.explo.org)

### What Is It?
I saw this: http://www.sailrite.com/Deluxe-5-1-2-Magnetic-Sewing-Guide#.U3Td8K1dVao and thought "I could make a compatible sewing guide with my 3d printer".

This one works well, but you have to make sure your magnets are the right size to go in the holes in the bottom. I used 1/2" by 1/8" magnets such as [these ones from Lee Valley](http://www.leevalley.com/US/wood/page.aspx?p=32065&cat=1,42363,42348) (who are the cheapest source of this kind of rare-earth magnet I've found, as well as being an awesome source of tools + hardware).

The source model is fully parametric in Onshape [here](https://cad.onshape.com/documents/477013cfa3c4666a1d161aea/w/3ee18be060bb6d2008429d94/e/21390684a5d99b0e5724f502), so if you wanted one with different magnets, or with different dimensions, you can fiddle with it there. I'm including two STL files: one that is roughly the dim