I typically hesitate to suggest making peanut butter in blenders, but the Vitamix Ascent X5 is the exception. It's the best blender I've ever tried, and you should definitely make nut butters with it.

I have four young kids who are all peanut butter fiends, which means we go through an average of three or more jars of the stuff a week. That’s why I was so excited to discover ...

“Bistrobot” is a pretty sweet sandwich-making robot. It toasts bread on the fly and applies peanut butter, jelly ... Indeed the whole machine seems like something we could build.