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Build a Polar 3-D Printer from Legos

Step 2Turn The Ultimate Fabric Painter into The Ultimate 3D Printer Extruder

Turn The Ultimate Fabric Painter into The Ultimate 3D Printer Extruder
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First of all, The Ultimate Fabric Painter uses an air pump to push fabric paint out when you cover a hole with your finger. Because we are using the Lego pneumatic switch to control the air flow we need to plug up this hole with hot glue.

Next, we apply a little bit of duct tape to the blue part, as it tends to pop out under pressure.

You also need to cut down one of the blue tips to a length of 3 centimeters. Make sure the cut is clean and flat.
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Author:Gene Hacker