One belt. One shuttle. Two mechanically switched toolheads.
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One X-axis belt
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One permanent drive shuttle attached to the belt
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Shuttle mechanically locks to one toolhead at a time
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When the active head enters its dock, a fixed cam or release pin opens the shuttle latch
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The dock holds the parked toolhead while the shuttle travels to the opposite side
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The shuttle locks into the next toolhead, then the dock releases it
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No independent toolhead movement
Think of a garage door trolley. The shuttle stays attached to the belt, and when the toolhead reaches the dock, cut lever gets pushed to release the latch from the shuttle.
Just a rant for now… but maybe it turns into a project.


top weight on bedslinger - more ringing and gantry flex - already spend our mass budget moving the bed. Plus speed... the second head can stay loaded, hot, primed, and staged independently. Dock, swap, go.
– ProtoBit