MCU Box Cable Grommet

Printed in Inland TPU.  In general, print it slow with a cool print bed.  Printed on textured PEI at 35C and Nozzle at 230.  

You can print this and add it to anywhere your wires go through a hole.  You can resize it as needed in your slicer if your hole is not 2mm.  Although it doesn't immediately fall out, I do recomment a drop of two of super glue for peace of mind.  Step file included if you want to make it longer and keep the same rib spacing.  Otherwise you can lengthen as you like or just cut the size you need off the print.