Step 1:
The paper is 20x20 centimeters, prefold in three parts of the same size.

Step 6:
Open the model.

Step 5:
Fold the edges to the centerline three more times.

Step 2:
Cut off one part and fold the large part in half.

Step 4:
Fold the edges to the centerline.

Step 3:
Prefold in half.

Step 10:
Done.....

Step 8:
Cut along the prefolded lines, use the line of step 7 as guidance

Step 9:
Roll up, use tape or glue.

Step 7:
Prefold over the purple line.

Step 16:
Fold over these three lines and turn the model.

Step 15:
Press flat

Step 12:
Glue or tape both papers together.

Step 11:
Prefold aluminum foil or paper in another color around the smaller piece.

Step 14:
Fold over these two lines

Step 13:
Fold over these two lines.

Step 18:
Fold over this line

Step 17:
Fold the edge straight upwards

Step 19:
Bend the edge into a circle and glue/tape both ends together.