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Every file downloaded from this tool — the worm's and the wheel's STL and STEP, the spline shaft and washer — carries the whole design and the page as it was: both parts, every card, the units. Selecting one here puts the page back. Import is a step like any other: Undo takes it back.
How tight a hole a set screw cuts its own thread into — it depends on your printer and filament, not on the gear. It applies to every set screw held by its own thread, in the worm's hub and the wheel's, and is saved with each design; new designs start from your default. Captured-nut screws pass through a plain clearance hole and heat-set inserts use the hole you enter, so these settings don't change them.
The most torque the hub pins carry from the part to another pinned against one of its faces — a flange, a pulley, a gear. Three things can give: the pins shear where the two meet, or they crush the holes in this part or in the mating part. The lowest of the three, over the safety factor, is the maximum operating torque.
Material values are typical (estimates), for printed walls; bearing is taken as the printed walls' tensile strength. Printed plastic creeps under a steady load, so keep the safety factor up for a constant torque. The teeth and the shaft drive are not rated here.