Customizable Magnetic Hook

This simple hook can be configured to accept any size of round magnet and any size of hook.

A small amount of supports are needed to prop up the end of the hook.

The customizer seems to have been buggy of late, here's the direct link if it isn't working from the button:
https://customizer.makerbot.com/things/4247121/files/8154228

I could have designed this to have the magnet fully integrated into the print however I chose not to for a number of reasons:

* the magnet can be heated beyond its curie temperature during printing and lose magnetism
* the magnet can attach to any ferrous metals in the extruder and cause the print to fail
* the magnet can't be easily retrieved once embedded into the part

Printed in the photos using Filamentive's excellent [moss grey](https://bit.ly/moss-grey-pla)