Solution for Oskar's Knot Mass puzzle

These images depict the assembly process of Oskar van Deventer's Knot Mass puzzle. Pieces that are "new", or have been moved are drawn in green, others are drawn in brown. (Drawings by Oskar.)
There are six different kinds of pieces used in Knot Mass:

The letters that are shown on the ends of the pieces are for identification in these images; they are not present on the pieces of the real puzzle.
The puzzle consists of 16 pieces of type A, 10 of type B, 2 of type C, 4 of type D, 2 of type E and 2 of type F.

Take two pieces of type A and two of type B and put them together like this:

Insert two pieces of type A:

Insert the two pieces of type F and the four of type D. The holes in the pieces of type D end one unit closer to the top end than to the bottom end:

Insert three pieces of type A:

Insert one piece of type B. In order to do this, two pieces of type A must temporarily slide down. This is easily accomplished by rotating the puzzle on a side:

Insert two pieces of type B:

Insert four pieces of type A. To insert these pieces, rotate the puzzle on a side, slide the sub-assembly consisting of three pieces of type B and three of type A a bit up, then slide two pieces of type A around the pieces of type B closest to the bottom en then into the sub-assembly that you moved up. Repeat for the two pieces of type A on the other side:

Insert the two pieces of type E. In this image they're shown not quite inserted, so you can clearly see where the gap of the pieces goes:

Insert two pieces of type A. Again you'll have to put the puzzle on a side to accomplish this.

Insert the two pieces of type C and one of type A. The pieces of type C must be put in their final position. The image shows them partly extended so it is clear where the gap goes.

Insert two pieces of type B. Once again, you'll have to rotate the puzzle on a side to do this.

Hook up two pieces of type A:

Insert two pieces of type B:

Move the two pieces of type C to the left:

Move the leftmost two pieces of type D down:

Slide the leftmost piece of type A that was sticking out in:

Move the leftmost two pieces of type D up again:

Slide the two pieces of type C back in:

Move the two topmost pieces of type B to the left:

Move the rightmost, vertical pieces of type A down:

Insert the last piece of type B:

Move those pieces of type A back up:

Slide the extended pieces of type B back in:

Move the rightmost, vertical pieces of type D down:

Slide the piece of type A that is sticking out at the front in:

Move the pieces of type D back in:

That's it.

Photo

The Knot Mass puzzle shown below was laser-cut by Buttonius Puzzles & Plastics from (nominally) 8 mm thick clear Acrylic (PMMA. The height of the puzzle is approximately 105mm.