Turn a drink carton into an milky-monster!

Duration: ~45 minutes



  • 1 Milk Carton (with a screwable top cap)
  • 1 Small cord - recycle string from a used tea bag
  • 1 Paper clip


  • 1 micro:bit, battery holder and 2 AAA batteries
  • 3 Crocodile clips
  • 1 micro servo - 9g SG90
  • 1 servo clip designed for Milky Monster, download at thingiverse (optional). Teachers may prefer to download the classroom pack (16 servo clips).


  • Small knife and scissors that can cut cardboard
  • Tape (masking, duct tape, and/or packing tape)
  • Glue gun

Step 1: Download and cut the template

Download the template and cut out the template.

Step 2: Glue the template onto the milk carton

Glue the template on the milk carton.

Step 3: Cut carton

Cut the carton (watch the fingers!)

Step 4: Create the mouth

Cut the cardboard halfway and fold the corners. This forms the mouth of the Milky Monster.

Step 5: Extend the mouth

Use tape to extend the mouth approx 1 cm. Fold one after the other.

Step 6: Connect cord

Using scissors, create a small whole to insert the cord. Tape the cord on the back side of the mouth.

Once finished position the mouth in upward position and fix the cord between the cap.

Step 7: Create space for micro:bit

Use scissors to create space at the bottom of the Milky Monster to attach the micro:bit.

Step 8: Create space for cables

Create space to route the cables nicely on back of the milky-monster.

Step 9: Attaching clip to servo

Use a philips screw driver to mount the servo to the 3D-printed servo clip. If you don’t have the 3D-printed clips available, download on thingiverse, or fix the servo using tie wraps or a glue gun.

Step 10: Attaching servo to milk button

Glue servo to the cap of the milk carton.

Step 11: Cut out a hole in cap

Cut out a hole in the cap to guide the string to the servo.

Step 12: Connect crocodile clips

Connect the crocodile clips to the servo.

It’s ready!

Your milky-monster is ready, it is time to decorate it! Customize the milky monster to your taste!

NEXT: Code