This is a part that you can use to prop open the glass lid of the Qidi Plus4 for ventilation purposes. We were tired of lifting the lid off and putting it somewhere. This also still keeps the cats out (in theory). TPU or similar recommended for grippiness. I was a little surprised how stable the lid actually feels.

Notes: I did not do precise calculation here, just eyeballed the angle. It works really well but doesn't look perfect or feel like a fully satisfying fit. STEP file included!