This is a lever for Franke Sink Waste opening / closing. Original lever got broken one day so I reconstructed the part based on the original broken part. Works like a charm.
I printed the prototype in PETG 20%, only 15% infill. It haven't been broken yet but I recommend to do 100% infill since this is mechanically forced part and could get easily broken.
I haven't tested if boiling water destroys or significantly deforms the part in case some hot water is briefly poured into the sink. In case this is a problem, we could use ASA or some more heat resistant material.
The author hasn't provided the model origin yet.