I saw a NE3 otoscope for ear inspection on ebay for under £10.00 - decided to get one and try to set it up as a nozzle camera on my Neptune 4 - images are OK considering the price.
I made a clip on camera holder to try it out. the clip fits nicely to the front of the print head but as it stands the camera can't get a view of the nozzle.
I removed the silicone rubber nozzle cover a while back - more trouble than it was worth.
Needs work - removal of print head base plate - done - and works well - I would upload a video but Thingiverse does not appear to support direct upload of clips.

I have reworked the thing twice - hence uploaded mk3 version which when printed in PETG fits perfectly on my machine - however the angle of the hole is a bit shallow so I had to do a bit of filing and used a couple of lines of hot glue for the camera barrel to rest against and maintain a good angle. I will do a mk 4 to address any issues