Trickster pen for students 3D print model

Design solidworks.Inside there is just a normal BIC pen.i devised this cool gadget for students since it was one of my favorite tools when i was a student.rotate the tail to rewind the tape.i don't say it's cool to use one, but let's be honest, anyone at school made his own cards with formulas and don't get caught,it's always better to have a plan B if your memory fails you.have fun.