After upgrading my Anet to an AM8 frame, I tried many different knob designs. Some would be a bit small, providing very little leverage for the awkward space available below the print bed. 

Others would be wider, and worked great until they were run over the rod mounts where they would sometimes snag/impact with the screw head. Eventually, I tried my hand at designing my own and after a few iterations this is what I have come up with. 

A thin bed level knob which provides good leverage, allowing you to more easily level/tram your bed, while also clearing all the rod mounting hardware. 

This should easily fit over the stock m3 nut on your bed, add it over the bolt, before adding the nut. Start the thread by hand, and then allow the spring tension to pop the knob over the nut. 

Print Details

• Printer: Anet A8 
• Layer Height: 0.16mm
• Infill: 100%
• Supports: None

Hopefully this helps anyone else with an AM8, or anything similar! Step file included if needed.