Onigiri +2

This is my reimplementation of Teddy Sakamoto's Onigiri puzzle. 

In the original puzzle there are 5 ball bearings, in this puzzle there are 7x 17mm bearings. The starting position and the solution to the puzzle are also different from the original puzzle.

In order to assemble it, print the frame and insert all 7 bearings. Manipulate them until there is a triangle of 3 bearings at the bottom and another triangle of 3 bearings at the top, with the final bearing sandwiched in the middle.

It should look like this.

The goal of the puzzle is to remove all the balls from the frame and put them back in the starting position. 

Let me know how you like it! I may adjust the parameters of the frame if the solution is too easy. I have found it to be quite enjoyable to solve and my children really liked it. Make sure to hand over the puzzle in the starting position for maximum complexity!

Happy puzzling!