Parkside battery PAPK 12 shell

I needed to replace the shell on second-hand batteries (PAPK 12 A1 and A2, and probably onward compatible).
The previous owner seems to have sanded the fins/bumps for compatibility with old 12v Parkside tools (after the 10,8v and before the "12v team standard" I guess), but with the added risk to put them in the wrong orientation in the charger and frying it (we went fine for more than a year thanks to a basic colour coding clue for charging but now I'd like the mechanical safety).

The original project from which mine is derived was a good starting point but I had to tweak a few things to have a correct fit.

• fins size and orientation
• too tight to fit the original 3 cells inside
• bonus : flipped upside down to print without automatic support (already here, small ribs added instead)

To be improved

• a bit tight when inserting the battery pack in a tool, may need a very light sanding (Sketchup 8 file included)