A replacement NUT for the T8 Nut because all available on thingiverse or so doesn't fit ...

Print instructions

I used normal PLA with the normal PLA settings in prusa slicer ...

The nut has a tight fit.

It is better if you heat up a spare T8 rod on one side and then screw the nut on this rod from the hot to the cold zone.

Then the nut runs super smooth.