Farnsworth built the Time Machine allowing them to only go forwards in time, to prevent something stupid happening like Fry being his own grandfather. As the story progressed, there was actually a time period where a backwards time machine was made.

Why didn't they go on one in another universe to get that time machine to go back in time so far that it reached their own universe?


Because it was faster and less complicated just to spin around to the next universe again. It took, what, 30 seconds?


Probably because they didn't want to run into themselves.


Because the Professor and Fry didn't want to stay in the time that Bender wanted to, when they found the time with a backwards time machine Bender got back at them by going further into the future.

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