Since the filament comes from above, I had to extend the holder for the hydrometer a little. I hope this is possible for the creator of the construction https://www.dingiverse.com/vivamus3d/designs ok.

Update: I had to modify the holder again after the PLA used which I used threw something when it got warm. I don't know if other filaments endure more warmth. Now I first grown stabilizers on the right and left and hope that the holder now keeps an attitude. ;-) If the improved version stops, i also post a photo of it.