Update Module_Build_From_Scratch.md

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@ -10,7 +10,7 @@ The Arduino Pro-Mini is available many places online. Check Sparkfun (the origi
A module case that fits your receiver like the one [here](https://www.xtremepowersystems.net/proddetail.php?prod=XPS-J1CASE)
<img src="https://www.xtremepowersystems.net/prodimages/j1case.jpg" width="200" height="180" />
or you can 3D print your own from a selection on Thingiverse ([Example 1](http://www.thingiverse.com/thing:1852868) [Example 2](http://www.thingiverse.com/thing:1661833)).
<img src="http://thingiverse-production-new.s3.amazonaws.com/renders/55/1c/cb/0a/e4/5d2c2b06be7f3f6f8f0ab4638dd7c6fc_preview_featured.jpg" href="(http://www.thingiverse.com/thing:1852868" width="250" height="200" />
[<img src="http://thingiverse-production-new.s3.amazonaws.com/renders/55/1c/cb/0a/e4/5d2c2b06be7f3f6f8f0ab4638dd7c6fc_preview_featured.jpg" width="250" height="200" /> ](http://www.thingiverse.com/thing:1852868)
You will require a second Arduino or a FTDI (USB to TTL serial) cable to program the Pro-Mini. Like the one [here](https://www.sparkfun.com/products/9717). **Make sure you get only a 3.3V FTDI cable - or you will fry your 3.3V RF modules when you connect it up.**