Improvements to Nikon Coolscan 5000 (4000) Full Roll Spool Adapter

This is a few improvements I made for mmsaxer1998's excellent adapters for the Nikon Super Coolscans.

The first is a support for the rear spool that screws into the back of the scanner. Created this because I keep having issues with it falling off my scanner and it was better than tape. There's also a small plastic washer, these are spacers required to mount the support, you'll need to print 2 of them and they go on the back screws between the support and the scanner's body.. The spool slides into this holder and just stays in on its own by friction. You could glue it too if you want.

The second is a version of the front spool's side cover that has a ridge to prevent it from going too deep inside the cover, a problem I had.