RepRap: how to make a hobbed bolt.

One of the fondamental parts of our 3D printers is the hobbed bolt, that drives the filament into the HotEnd; there are a lot of good ones on sale, but you could need to custom it, like me.
Obviously you should use a lathe with gear-cutting and a good bit to do it precisely, but I did it without these tools.
Let’s see how.
I took as an example some procedures that I found in this wiki.

Things you need:
-the extruder
-a drill press
-a dremel with some cut-off wheels
-a cylindrical file
-a Dremel Holder
-a bolt

You can start putting together the bolt, the big gear and the washer with the extruder.

Insert the filament into the extruder and mark the bolt like this:

Attach the bolt to the drill press and mill it between the signs with cylindrical file:

Print the dremel holder that you can find here:
http://www.thingiverse.com/thing:25062#sthash.vE6YfDv7.dpuf

If you use the Dremel’s flex shaft attachment you can also download this one.

Cut along the bolt grip at the milling; I suggest to use the gear teeth to obtain equidistant cuts.

Then drill between two theeth with cone router bit to obtain more cutting edge:

This is the outcome:

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