Those motors all look a bit under-powered, but may work just fine for a Kossel. I would be a bit worried about using one for the extruder though. Generally you want motors that are less than 3Ohm and rated for 2+ amps. This usually means motors that are rated for 6V or less (our stepper motor drivers limit current, so we can safely run them off of 12V). Running a motor rated at 1 amp at full current will cause it to get quite hot (though still technically within normal operating temperature).
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