Squeegee.

The polyurethane blade in a holder that drives ink across the screen and through the open mesh, and the variable operators argue about, because three of its properties move the deposit at once: hardness in Shore A, edge profile, and the angle and pressure applied to it. Fimor, which makes the serilor blades, sells down to 35 to 55 Shore A for direct printing on ceramics and builds multi-layer blades pairing soft polyurethane for conformity with hard polyurethane for mechanical resistance, which is the whole argument in one product: soft floods, hard shears, and a layered blade tries to do both. Blades are consumables and they wear round, so the same maker's care notes say to sharpen only dry blades, never one still soaked with solvent, and never to take too much material off in a single pass; it also warns that storage temperature and humidity move the hardness you paid for. The error is chasing deposit with pressure, because a rounded edge and a harder push look like the same fix on the first shirt and only one of them is free. A rounded blade fills the dots on a halftone job quietly, and the run is already on the pallets before anyone reads a shirt properly.