Shutter Hooks

The shutters on the workshop doors have a tensioned spring that is designed to provide an assistance when lifting them. It works well and the effort required isn't too bad, even with the big shutters. At the top of the travel, however, the spring isn't under much tension, and so the shutters have a habit of drooping after they have been lifted. I thought about drilling out some lock slots in the runners, but that would have required completely dismounting and disassembling them, and I don't fancy that. So, off to the 3d printer again, and I made a hook and hinge:

 This is the hinge and hook assembled as it will be used,

and this is the hook in use on the big shutter. The force it needs to exert to hold the shutter up is very small and PLA is easily strong enough.