This is another knob version used to replace the M3 wing nut on the Wanhao Duplicator i3 / Cocoon Create / Monoprice Maker Select printers.

When installing, you need to use four M3 nuts. The groove design of the nuts is rather tight, so it is recommended to use long-nose pliers to press them into place to ensure a secure installation.

In addition, I suggest installing anti-loosening nuts under the heated aluminum base, which can effectively prevent the M3 bolts from idling or loosening.

Personally, I prefer this oversized wing-shaped knob. Compared to the common round knurled knobs on the market, it is more comfortable to use and has a better feel when making fine adjustments.

Edit note: Based on user feedback and comments, I added a smaller version. In some cases, the original size may interfere with the printer frame, but the new version can perfectly avoid it. However, in my opinion, the original size works just fine.

Edit note: If you need to make further modifications, you can click on this link to copy and edit the model on the OnShape platform:
https://cad.onshape.com/documents/be1f228b579d4336988c6cb8/w/5a05657c1cc382bbebb4fab8/e/d1a8e55a81200a8af491cb3b

Edit note: In response to everyone's needs, I've added 5.25mm and 5.75mm hexagonal holes to the model to accommodate different sizes of M3 nuts and flexibly address the problem of mismatched nut sizes caused by hole diameter deviations in various printers.