What can I make with it besides pin-back buttons?

Vevor lists fridge magnets, bottle openers and keychains as other projects. Those need the matching button parts for each style, which are not the same as pin backs.

How many buttons does the included supplies make?

The kit includes supplies for 500 buttons. Once those are used, you buy refill button parts and clear film in the 3-inch (75 mm) size.

Is 3 inches a good size to start with?

It is the largest common button size, so artwork reads well and photos fit. Smaller 1-inch and 2.25-inch presses use less material per button and are cheaper to run in volume.

Do I need to clamp it to a table?

It is a manual bench press with a widened base, so a stable, flat surface helps. Clamping or mounting it keeps the base from shifting during the press cycle.

Does it work with other brands' dies and button parts?

Dies and button parts are matched to the machine's 3-inch (75 mm) format. Buy refills made for this press rather than assuming other brands' parts fit.