Summary
I made this slot grommet to go with my Ikea Lack table setup for my Prusa i3 mk2.5
Two things make this different than other grommets I looked at.
it is a slot and long enough that when my printer is doing a tall job that my filament isn’t bending at crazy angles.
The slot is big enough to allow my ptfe tubing to go through it without binding or sticking.