A number of people have asked me about the grooved nut that goes on the Genie MK2 hotend.
It can also be used on the Genie MK1 hotend if needed and is also reversible so that it has different lengths because the groove is not in the middle.
Here is a drawing of the grooved nut and also I have made an STL file for download if you want to print one out for fitting or using while designing a mount for the hotend.
STL file for grooved nut
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