As 3D printing pens get more popular, we see the original 3D printing pen, the 3Doodler, inspiring some very exciting Doodled projects. Some of these projects are featured on 3Doodler's website as PowerDoodler Activities. Here, 3Doodler's Samson Wong brings us a cool PowerDoodler Activity: a V-Twin Engine with Moving Parts. This step-by-step instructional tells us how to Doodle tubing inside and out, design engine parts using your DoodlePad, and then put it all together. If each step is done correctly, your Doodled V-Twin Engine should move! Read more at 3DPrint.com: https://3dprint.com/127252/3doodle-a-v-twin-engine/