Simple camera mount to a small usb pi-camera. I've fitted this with an old pi-camera I had laying around, which had a microphone (hence the extra hole) - I note most pi-camera's don't need this hole.

I stripped the usb lead of outer cover for the section that is placed inside the aluminium extrusion to aid fitting.

The camera placement is just high enough to see the top of the bed when printing the 1st layer.

Note this can be fitted with either one or two screws (depending how many nuts are pre-loaded - by removing the 2nd left hand support. You'll see from the photos extended to support from both sides as I was worried it may start to drop over time with only one side supported.