Before we start I'd like to tell you a little about myself, I'm a 16 years old student from Israel playing for the local robotics FRC team as the head CAD department. I mostly design random contraptions of things that sound impossible and slowly make them work; for this project I have a literal shame-can with about 50 broken, too tight, too large, too stiff, too small, cut inducing or generally failed prototypes but I wanted to get it just right and did not have a lot of time to do so.
And oh boy, am I exited for this one! I made these designs originally for the MakerEd Challenge 2.0 with about 80% of the work done in the AM's. The idea for this project is from every day observations in my school. I see my Math teacher struggling to draw a shape that is even close to a circle for Geometry lessons. I see my Robotics teacher barely able to dash over sketches on the board without leaning the whole arm (with a simple modification the same Dasher and do many types of lines, but Math teachers barely need center-lines or Mirror-lines). And I can see my fellow students (including myself) unable to copy Geometry assignments from our book to our notebook, and also my teachers planning the next homework task or test, they also need to copy those markings! We all have enough to worry about with the assignment itself and we don't need any more obstacles. The gadgets I made work with Sharpies and Expo What-Board markers for a few reason, they are sold all around the world and have a very consistent structure.
But to be honest even as a student with a white-board in his room, I could still use those gadgets with home work, planning my next project and drawing!