Rigidbot Double Belt Connector
thingiverse
Inspired by Dennis Brown's 20T X carriage pulley conversion. This should solve pulley offset for X or Y if you change pulley size. This also allows you to try a smaller pulley without trimming your belts, leaving out screws, or holding belts together with binder clips. I haven't actually tested with a smaller pulley yet, so let me know if this works for you. EDIT: Added more variations for different belt orientation and mobius setups. Untested.
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