I designed these mounting brackets myself with Fusion 360 after realizing that I had forgotten to think about mounting options when buying my glass bed (IKEA Mirror). My primary concerns were low-profile and easily adjustable and removable glass bed. Additionally, I prefer to design models for 3D printing without supports.
This bracket is only about 1-2mm higher than the top of the glass bed. It also features holding via M3 bolts and nuts.
The brackets allow the glass bed to be slightly larger than the heated bed.
As written in the print settings, it is important to consider the material you print this in.
Amazon Basics PETG
PETG or other temperature-resistant filament is recommend when your bed temperature is commonly above 60°C to avoid melting. If you only print PLA, this can be printed with standard PLA.
If your slicer supports overriding infills in specific areas, it is recommended to increase the infill to 100% just around the mounting hole.
After printing four of these, you will need to add two M3 bolts and nuts to each corner bracket.
The M3 bolts I used were 12mm long, but anything from about 10mm to 20mm should work.
The M3 nuts should sit flush like shown in the image.
To mount these on your printer, you will have to take each of the four screws holding your heated bed out. It is recommended to mount these one at a time, this way you don't have to try and get all screws lined up again at the same time.
NOTE: This image is of the the first time I printed this in PLA, I have since replaced these brackets with ones made of PETG. The model is the same.
PLA Version pre-assembled