6 Tongues Puzzle

Inspired by the video "IMPOSSIBLE puzzle box to rebuild" on the Youtube channel of "urbantomato" I designed this nice little puzzle, because I nowhere could find it for 3D printing. It is again in a serious of "I'd need a third hand" puzzles ;-) Even if You know the solution, it is really challenging to assemble the 6 tongues without force like shown in the pictures.

There are 4 equal parts and 2 different ones. If You have problems to succeed even knowing the correct solution, You can try the helper parts to stabilize the tongues during the assembly, so they won't tilt all the time.