Cable management clamp for printer bed, to avoid bending and breaking at the joint.  Made the top 5mm shorter than bottom, to ensure you can use steel/PEI sheet that is slightly larger than bed.   I use 310mm sheet for 300mm bed for ease of removal, like on CR10 printers.  Designed to snap on and/or to be used with 2mm zip ties.  Print out of ABS, or ASA because it will come into contact with edge of the bed.  I tried PETG it was working but over time warped a bit, so PETG would not be a good choice for being around high temperatures.   Tolerances are made for high shrinking materials.  Let me know if they work for your settings or you need it modified.  I included a STEP file if you want to tinker with it.