Electromagnet 2

This is a follow-on to http://www.thingiverse.com/thing:904

It is a cylinder with a helical channel. The channel is designed so that the part can be printed without any internal support material. This was printed on a Dimension uPrint with zero internal support material.

The hollow channel can then be filled with low-melting-temperature metal alloy to form an electromagnet.

Due to the low number of turns, the performance of the electromagnet is poor. This is really just a proof-of-