Mixpre users know that using the HP knob can sometimes be complicated because of its tiny size.
This knob extention offer a better grip, is easier to reach than the original one and still works with thick heaphone jack connectors.
This 3D printed extension is made to go over the basic mixpre knob, you just have to remove the original rubber band. It can be used on all models of the MIXPRE series.
You can download the .stl file here. Commercial use not allowed.