Now with an “Open in Customizer” button! Want to use a glass plate on your print bed? Don't want to change printer settings to make that happen? Just put this shim on the print bed underneath the Z-axis trip-switch so that the trip-switch gets pressed one glass plate's thickness early. IMPORTANT: Make sure you read the Instructions under Thing Info! There is vital information there! If your printer is like mine, the printer prepares to print by (among other things) raising the print bed platform until it hits the trip-switch. The height it achieved at that point is its maximum height, from which layer height offsets—e.g., the first-layer offset—are subtracted. Inserting a shim under the trip-switch changes the maximum height my printer will arrive at. IMPORTANT: YMMV! Not all printers work the same way mine (PowerSpec Pro/Flashforge Creator Pro) does. If your printer ignores the shim and starts carving a path in the glass, stop the job immediately. NOTE: Not all glass plates are the same thickness. I've deliberately left out the .stl file for this reason. See below. I previously used the glass from a 5×7" photo frame I bought at the dollar store; it's not quite as big as my print bed, but close enough. I've since switched to a custom-cut sheet of glass from OSH, which fits my print bed exactly. Both work fine; I only switched because I need my whole print area for an upcoming print. What should happen is, with the shim in place, the shim will hit the trip-switch, and the printer will set the maximum height for that job to be that thickness lower than it would without the shim. You should then have a successful print on top of the glass. If your printer doesn't work like mine, doesn't have a z-axis trip-switch, or ignores the trip-switch measurement and goes by software or firmware settings, then this won't work for you.