6 different sized airsoft grip.
Use 5x30 mm hexbolt.
Printed with 0,6 mm nozzle. 3-4 walls. 0,24 layer height. 20% infill.
Printed in PLA + 870 3DLAC.
Very strong.
You can also use fussy skin to give it some grip.
I used 0.3mm fuzzy skin point distance and thickness 0.5mm