My Eureka moment last night was to use pulleys and cord/belt rather than gears.

3D Printing
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My Eureka moment last night was to use pulleys and cord/belt rather than gears. Routing it around the horizontal wheel like VHS machines would route tape allows the wheel to be moved back and forth without changing the belt length or tension.

Any thoughts?

Anyone in the Bromley, Kent UK area that needs skate bearings see Carl at Snow and Skate City.

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What is the application for this arrangement?

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A re-spooling contraption that will ensure the filament is wound nicely on the new spool.