The kit includes knobs for the five most commonly used standard/imperial nut and bolt sizes: ¼"-20, 5/16"-18, 3/8"-16, ½"-13, and ¾"-10. Of course, you can also scale them to fit bolts of other sizes.

On my old printer, I had to use skirt printing, but my Bambu A1 and textured PEI printing board allow me to print without the need for skirt printing.

I tend to misuse these knobs, installing them on workshop tools or using them outdoors. Therefore, I usually print them using PETG material, thickened casings, and denser filling densities. I have a set that has been used outdoors in my chicken coop in the Pacific Northwest for three years, and they are still sturdy and durable.