Knurled Knob for M6 lock nut https://www.thingiverse.com/thing:4359647 is also good.
t-nissie
about 4 years
I bought an M6 finger nut from Neji-no-Tomimori, a parts shop in Japan.
You can print a finger nut, too. For example, https://www.youmagine.com/designs/finger-nut .