An Eye-cup replacement for your broken camera, microscope or telescope eyepiece. Print with support. Designed for my Lumex with 26mm eyepieces but can be scaled up or down to suit any similar application. Print it out of a darker plastic so it blocks the light better. Twists right onto the metal threads of the old plastic mount or it can press fit onto a smooth optic tube. Mine was a bit tight so I printed it at %101 for a perfect fit.