[ericthered]

As a GM I'd allow a successful roll to intentionally trigger mishap-12. I'd make sure that it's not something you want to do a lot though.

I'd rule the conveyor can only do this by aiming for a specific world and then intentionally defocusing. It can't aim for nothing and then leave. If it doesn't have a program to travel off a timeline it can't leave.

I'd generally stick lost conveyors on known worlds, and I'd probably reuse the same dozen worlds when defocusing on a given destination.

I'd also probably make the convoyer require maintenance and fixing after such a use.

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Its my understanding that infinity can crunch numbers to find new worlds. My opinion is that a conveyor mishap just uses up that computer power to find where the conveyor went: you don't actually save any resources.