This is intended to make accessing the bed levelling knobs on the FLSUN Cube easier as well as allowing the fitting of Bed Levelling "Tires".

Unfortunately the FLSUN Cube like most default 3D printers has some... sub-optimal features. One of these is that the knobs for bed levelling are quite small and difficult to access as they are recessed into the cavity of an L-bracket.

This knob is designed to extend beyond the lip of the L-bracket thereby making adjustment much simpler. Further it is loosely modelled upon the bed levelling knob for the Anycubic i3 making it compatible with MKingCharles excellent Bed Levelling "Tire" which it would not natively be able to fit.

This knob could potentially be used with 3D printers other than the FLSUN (in conjunction with the tire) -- or -- as a standalone bed levelling knob in its own right.

Potential heat leakage from the heat bed hold down bolts was initially a concern. For this reason, the design uses proper nuts (as opposed to just threading the plastic). However this has not proved to be an issue to date.

A washer was also designed although it was found that using spare washers from the original FLSUN installation was preferable.