Step 1:
Prefold.

Step 6:
Now you've made a hexagon.
Prefold

Step 5:
Fold over these two lines.

Step 2:
Valley-fold.

Step 4:
Valley-fold.

Step 3:
Fold the corners to the spots indicated by the arrows.

Step 10:
Press flat.

Step 8:
Prefold.

Step 9:
Fold over this line

Step 7:
Fold over the prefolded lines, start at 1, then 2 etc.

Step 16:
Turn the model.

Step 15:
Sink fold over the outer line and fold the center upwards over the inner line

Step 12:
Repeat steps 8 to 11 on the other two same places.

Step 11:
Fold the flap downwards.

Step 14:
Open the model.

Step 13:
Prefold over both lines.

Step 21:
Fold these two edges upwards, do the same on the other five parts of the snowflake.

Step 19:
Fold the flap upwards

Step 20:
Repeat step 19 on the other five flaps.

Step 18:
Press the model inwards again

Step 17:
Fold the six flaps outwards.

Step 22:
Fold the six edges sidewards.