Looking to use 3D printing to make a master plate for rubber stamp vulcanizing
This would likely not work. ABS has a glass transition temperature of 105&nbsp;°C. It doesn't have a melting point because it's amorphous. Rather, as you heat the part up, it gradually transitions from a solid to a viscous liquid, but there is no "hard" transition from solid to molten at one particular temperature.

The glass transition temperature, at 105&nbsp;°C, is significantly lower than the 200&nbsp;°C "melting point" of ABS you quoted. At 160&nbsp;°C, while ABS would not be molten sufficiently for 3D printing, it definitely becomes flexible and would deform easily.

I do not think it would hold its shape very well over the long period of time it has to spend in your vulcanizing machine, under high pressure and well above its glass transition temperature.

The surface of 3D printed objects also usually has a somewhat rough finish. If you wanted to make satisfactory stamps, you would probably need to spend a long time manually finishing the 3D printed master before making a mold from it.