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You should have already prepared the x-carriage belt paths but we will repeat instructions. There are two belt paths on x-carriage.

Use TOP belt path for Bear axis

Use Bottom belt path for Prusa axis

Add 4 tooth long segment of GT2 belt in unused path to reinforce thin, toothed plastic segments.

With tensioner bolts engaged but only screwed in 1-2 turns, insert x-belt NEARLY taught, but remaining loose. There is plenty of adjustment range. No need to stretch belt while putting into clamp.

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