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Sink Pop-Up Lift Rod Set-Screw Knob
This knob replaces a lost or cracked finial on the lift rod of a bathroom sink pop-up drain. It is 24 mm across and 33 mm tall, with a fluted grip. A 6.4 mm blind bore takes any plain or threaded lift rod from 3 to 6 mm, and a side M3 self-tapping set screw (2.6 mm pilot) clamps the rod against the far wall of the bore, so you don't need to know the rod's original size.
Through-Glass Shower Door Knob M5
A replacement shower door knob, 40 mm across and 35 mm tall. Print two and join them through the glass with a length of M5 threaded rod. Each knob has an M5 hex nut pocket (8.3 mm across flats), a 22 mm deep M5 clearance bore and a 25 mm × 2.2 mm recess on the glass face for a rubber washer. It fits 6–10 mm glass with any hole of 6 mm or larger, so you can replace a cracked plastic knob without tracking down the original part.