Suction bulbs for standard EKG/ECG machines' electrodes. I recommend using FLEX/TPU, printing with a 0.4mm nozzle, 0.20 layers hight, and 10% infill, depending on the hardness of the filament used (the examples were printed with Tinmorry 95A TPU). Honeycomb infill gave the better flexibility for this project.
The larger version contrast quite a bit with the normal bulbs, but have better suction. The smaller one is easier to press for suction. Playing with different TPUs and printing settings should improve on these shortcomings. (Please let me know what works better for you, thanks).
The author marked this model as their own original creation.