45mm m6 knob handle

One friend ask me to make 45mm diameter knob for some DIY project. I can't print it whole because of plastic curling. So I decide to split it in a half and assembly all after print.
Openscad source included.
I`d make one mistake - square nut for m6 is 10x10 mm but I make only 8x8 mm square hole. You can resize it in openscad or make m6 thread in m5 square nut or grind m6 nut.
Check the photos for assembly guide

PS
10mm m6 square nut version added