Little magnet hook

The little hook with space for magnet for hanging light objects on metal surface.
The magnet needs to be inserted during the print process. You may either:
* Manually stop printer just before magnet space is closing,
* Add "pause" command into G-code in proper place
* Split G-code into two parts and run them separately

A hook fits 12 mm diameter, 1 mm thick magnet. If you need a hook for bigger magnet, just resize the model in your slicer.

More information (Polish): http://3dwpraktyce.pl/2016/01/wydruki-z-magnesami-i-kukurydza/