Standardised 2" Telescope Astronomy Eyepiece Filter Cases

After getting annoyed with 1.25" Filters coming in a range of boxes, I thought it would also be sensible to make a similar pattern for the 2" filters.  This was a bad idea as the bigger design didn't lend itself to the pattern.  I got something that works eventually though.  Feedback has been that printing in 0.15mm gives a better fit than 0.2mm which can be a bit loose.

Features:

• 51.5mm ID internal cell for holding filter securely.  If you want it to be super snug you can add small strips of flocking material.
• ‘Wing and cut’ system internally allowing you to get good access to remove the filter without getting thumb prints on it.
• 1mm Internal rebate for foam insert.  I use +/- 2mm craft foam cut to a 51mm diameter circle stuck with glue.
• Range of depths to accommodate filters from 7mm to 21mm.  This includes the craft foam, so up to 24mm could work. 
• Quarter turn lid which is held on by friction from the base and lid.  The lid can fit either way as the design is symmetrical.
• 10mm recessed dot in the base.  This allows idntification of the bottom in the dark and can get a small reflective sticker in there or something so it's easier to see at night.
• Internal stops to prevent the case being turned past the closed point.

If you make the model and have any issues, please let me know.  I'd rather make something useful and will revise the design to make it more user friendly.

Update 20.07.23:  Feedback from users is that printing in 0.15mm Prusa MINI / MINI+ rather than 0.2mm will results in a tighter fit and a more firm seal.  Thanks for the feedback.  Hopefully this will be useful to other users.

Update 15.08.23 Feedback from user that printing in 0.15mm with a Voron 2.4 CoreXY in ABS gave a perfect fit!