Step 1:
This paper is about 20x20 centimeters. Fold in half

Step 6:
The prefolded squares pattern is used as guidance for the next steps.
Fold over this (prefolded) line

Step 5:
Prefold the edges to the centerline

Step 2:
Prefold over both lines

Step 4:
Fold the edges to the centerline.
Then unfold the folds of step 3 and 4

Step 3:
Fold the edges to the centerline.

Step 10:
Fold over this line.

Step 8:
Mountain-fold over this line.

Step 9:
Fold both edges towards each other, see arrow.

Step 7:
Fold the edge to the spot indicated by the arrow.

Step 16:
Start with the 2 valley-folds on the right, then the 2 mountain-folds etc.

Step 15:
Fold the model in half by folding over these prefolded lines.

Step 12:
Unfold the folds of steps 6 to 11.

Step 11:
Fold over this line

Step 14:
Mountain-fold over these prefolded lines.

Step 13:
Now the paper has a prefolded pentagon shape. Turn the paper and repeat steps 6 to 11 on the left.

Step 21:
Press these two edges against each other.

Step 19:
Fold this edge downwards

Step 20:
Repeat step 19 on the other 7 edges.

Step 18:
Now the model looks like this.

Step 17:
This is the other side of the model.
Repeat step 16 on this pentagon shape.

Step 22:
Prefold both edges in once over these lines

Step 28:
Repeat step 26 and 27 on the other star shape.

Step 25:
Turn the model

Step 26:
Press the edges indicated by the 3 arrows on the left against each other.
And press the edges between the arrows on the right against each other with your other hand.

Step 24:
Fold over these 3 lines

Step 23:
Make the same folds on the other edge

Step 29:
Fold the flap to the inside.

Step 27:
Press the edges indicated by the large arrow to the right.
Then press the model between the small arrows flat with your other hand.

Step 30:
Pull both parts outwards.

Step 31:
Glue all parts together.