30 B drop-in-nut M3

This is a drop in nut for 30mm B-type extrusion, the ones with 8mm slot width

You can go two ways

1. Built in threads
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Use the built in M3 thread. Higher resolution is better because of the threads. 0.1 worked well for me.
It is possible to do first 1-12 layers at 0.2 or first 2,4,6,8,10 layers at 0.25mm layer height. I did 1st layer 0.2.
Note that you can always print this version, try it out. If it doesn't work out drill out the threads and use a nut.

2. M3