The Square Drawing Mechanism … Check out SOLIDWORKS for Makers in my profile and use code ENGINEEZY for 20% off @Dassault Systèmes ••• Rotating motion naturally makes circles but getting a mechanism to draw sharp 90° corners from a spinning motor is a bit more complicated. The secret is a sliding connector link driven by the motor, paired with an elastic that pushes the carriage on an x-y gantry to its extremes. The elastic is what forces the sharp corners instead of rounding them off. I Designe