Very basic replacement lamp knob/key/whatever the hell this is called. Much easier to turn. Useful if you have people with limited mobility around their fingers.

Very fast to print as there are not that many travels a printer has to make, rounded corners also keep speed up.

The hole is tight to prevent it from falling off. You can heat the screw head to be able to melt the part in place.

Printed mine in 15 mins at 0.28 layer height, 20% infill

Inventor files included.

Creality

Ender 3

Doesn't Matter

No

0.28

20

Does not need much infill. 3 perimeters to make the hole stronger.