Under desk mount for Prusa Build Sheets - Eject button style

prusaprinters

Keep your build sheets out of the way and under your desk. This is an original design but it's inspired by the mechanism used in Whity's version of an under desk build plate holder. I've included the Fusion model for anyone who wants to remix.This design uses two non-FDM parts. A spring and a metal pushrod. The pushrod is easy, just cut a cheap wire coat hanger to length, most are around 2.3mm in diameter, but the included Fusion model has user parameters which should re-draw the model if you have a different diameter. The spring is just a spring from a standard ‘clicky’ ballpoint pen, see the user parameters in the Fusion file to change it. The design doesn't really need the spring but it does make the mechanism feel more polished.One ‘Bottom Rail’ just barely fits in the build volume of a MK2/3/4. You will have to turn off the skirt when you slice the .3MF to avoid going outside of the build volume. The ‘Top Rails’ are cut in half for easier printing of all pieces at one time. The ‘Push Button’ I printed in red to make it easier to see, but the only important thing is to print it with the hole for the push rod pointing down and to print it with plenty of brim for good adhesion. The coat hanger pushrod is pushed into the button a few mm, secure with CA glue. The cutouts for the fasteners in the .3MF files here are setup for some #6 drywall screws that I had lying around. You can drill out the upper pieces and get the appropriate length screws or CA glue everything together if you want to stack multiple rail sets. The whole thing is secured to the underside of a desk with some VHB tape, doubble it up if you need to clear the screw heads.