This is the Flashforge Dreamer glass bed upgrade 5mm shim. This is the same part that comes with the Makersome Glass Bed Upgrade kit and it works with glass plates that are 5mm thick. We redesigned this part to a little tighter tolerances that the others we had tried so it sits better and sturdier for more accurate printing on the z-axis. To Print: Print this with ABS or PLA (We use ABS). We use 0.2 layer resolution and there is no need for supports with 100% infill. I printed this with the extruder at 230C and 110C on the build plate. What you will need: 2 of the corner brackets 2 M3 screws that come installed on the printer bed 2 M3 fine thread wingnuts 1 Z-axis shim 1 Glass Bed Plate You can find the corner pieces here: http://www.thingiverse.com/thing:715545 To Install: Simply place it behind the Flashforge nameplate behind the print bed. It will fit snugly without any need for glue or screws. Make sure the side with the angle cuts and the pockets for the screws in the middle is facing down. For more detailed instructions and a video on how to install the glass bed upgrade follow the link below: http://makersome.com/project/717/ For a complete kit with all of the parts that you need, including the borosilicate glass plate follow the link below: http://makersome.com/store/glass-bed-upgrade-kit/ For borosilicate glass plates (glass only) click th elink below: http://makersome.com/store/borosilicate-glass-plate-glass-only/