Build a Polar 3-D Printer from Legos

Step 3 Make the extruder control valve

I have provided pictures of my extruder control valve below, I intend to add LDraw models as soon as possible.

Then attach the Lego pneumatic tubing to some Lego tubing so that it fits some aquarium tubing and the extruder tubing. If the aquarium tubing doesn't fit wrap a rubber band around it.

Then attach the hose to the aquarium air pump to the middle air port on the valve and the hose to the extruder to the right air port on the valve.

If you have any questions about construction, please post them in the comments