The included knob is designed for the Alps EC11 encoder with a 15mm tall plum shaft. Such as this one. If you are using a different model you might have to use a different knob for your board. 3MF ...

Assemble the Sofle keyboard like you would normally, but don't screw the fr4/acrylic bottom on. Instead screw the keyboard halves into Bottom with the m2x4mm screws.; Install the heat-set threaded ...