Done by Felix and uploaded only to"myminifactory".
https://www.myminifactory.com/object/3d-print-reusable-adjustable-spool-for-spoolless-filament-136426

I remixed it a bit, I need it for "Inslogic PETG 1kg refill" which I orderd by mistake.
Original files:

1. inside-part.stl - interconnecting parts (print 3 of them)
2. outside-part.stl - outer circles (print 2 of them)
3. screw-cap.stl - the screw holders (print 6 of them)

My remix:

1. inside-part-60mm.stl - wider 60mm interconnecting parts to support Inslogic refill
2. outside-part_remix.stl - outer circles with more way closer to the center to support Inslogic refill
   (the screw holder caps are the same)

The build required also:

• 6 x M3 screws (at least 8mm length)
• 6 x M3 nuts (originally square, but I used regular ones)

Pay attention that when drying the filament with such spool holder it may get deformed - I plan to add an extra holder for my Sovol dryer
Some photos will be uploaded later