If you buy AlzaErgo Table ET3 Essential with 160×80 cm desk and mount it in the middle of the desk, the handle to lift and lower the table will be too short and you won't be able to rotate it. This extension is placed between the hex rod and the plastic handle, extending it a few centimeters so it can be rotated.
I thought that the M3 screw will catch in the plastic, but it needs the nut. Your tolerances may vary.
If you pull too hard, the plastic handle will jump out of the printed extension. It depends on how well the handle fits in the printed part. Your results may vary.
Remixes are welcome. Here is the source https://cad.onshape.com/documents/6fecf51a28a5212f32038f42/w/12680458a482499f8f6de2b5/e/d87dffb6e07f0975f024b465.
The author marked this model as their own original creation.