I wanted to print the amazing Jar Candy Machine but using the 1 Litre Fluted Jar from Kmart.

Gave it a try using the modelling software to create a screw-top that would fit the on in the jar. After a couple of tries it worked!

This model requires a M4 20mm screw (without the screw the knob works but may fall out)

Make sure the knob still freely rotates when you install the screw, don't over-tighten or you will jam the knob. The screw should only be threaded in far enough to keep the knob from moving in and out of the base too much

The jar I used:

Fluted Jar

Layer height 0.20 | Base 20% Infill | Knob 25% Infill | No supports