junction box extension ring

Junction box extension ring for boxes with screwholes 60mm
There are some available but mostly in 1 or 2 sizes.
So decided to make one myself I can adjust to desired size.
Sizes inlcuded are 10 - 12 - 14 - 16 - 18 - 20 - 22 - 24 - 26 mm. Adjustable to your own needed length.

--> UPDATE 1: New STL files because there were some faces inverted which gave some problems with slicing. Also changed the orientation of the files for easy drag and drop

-->> UPDATE 2: New STL files / found out that the orientation of screwing holes was in wrong place. Switched positions. Should be fine now.

-->>> UPDATE 3: Adjusted screwholes after testing, they were too tight, also adjusted the insert part (-2mm) to save material

-->>>> UPDATE 4: Adjusted and refined the thicknesses on screwholes after finding a problem with inserting the sockets. Added more sizes in steps of 2mm. Also renamed to have better readability on printer screen.