This project started when my friend and colleague, Shahwar, sent me a link to an article on The Tinkering Studio’s blog, Sketchpad. We had been talking about ways to expand our lower school robotics program and she wondered if we could print some pen holders to attach to our EV3s. The article explains the iterations the Tinkering Studio staff went through to create an adjustable pen holder to attach to a Lego brick. It could be used on builds with the WeDo hub or the EV3 motor.
I downloaded the file for the Set Screw Version of the pen holder from Thingiverse and loaded it to the Up printer we use in the lower School Lab. They printed perfectly. Next came the step of cutting the threads, or tapping, the hole for the tightening screw. This will allow users to use any drawing tool that is the same size or smaller than a Crayola marker. My husband, Russ, never fails to have just the right tool. He found the ¼” tap and tap handle and we easily drilled the threads into the 3D printed pen holders.
Next step: Challenge my students to attach the pens and program the EV3s to draw geometric shapes on large sheets of paper taped to the floor.