Spiked clamps
thingiverse
A pair of quite angry 3d printed nipple clamps. Uses a standard clothespin spring. Mine were about 10mm wide with 15ishmm long arms, may need to adjust the model depending on the dimensions of what you have. To get good resolution on the spike, I printed with a 0.3mm nozzle. The first model is for a spring with a 4.5mm diameter coil, and the second is for a spring with a 6mm diameter coil with a longer spike. The 6mm is also slightly skinnier so that the clamping force isn't spread out so much. It's the much "angrier" of the two.
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