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Attach the front stepper mount to the top of the frame using (4) m3 x 8mm socket head screws.
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Attach one of the 0.9 degree NEMA 17 steppers to the front idler mount using (4) m3 x 8mm socket head screws.
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Install (1) 16t pulleys onto the stepper shaft with the teeth facing down. There are two set screws, be sure one of them is against the flat of the stepper shaft.
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Attach the rear stepper mount to the top of the frame using (4) M3 x 8socket head screws.
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Attach one of the 0.9 degree NEMA 17 steppers to the front idler mount using (4) M3 x 8 socket head screws.
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Install one of the 16t pulleys onto the stepper shaft with the teeth facing up. There are two set screws, be sure one of them is against the flat of the stepper shaft.
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Building the idler stacks is very similar to how the stacks were built for the Y carriage stacks.
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For the front idler, the stack for the outside bolt is the short stack. Turn a 12mm shoulder bolt upside down and install (1) M5 washer, then (1) M5 shim. Next add the 20T idler, then lastly (1) M5 shim.
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Install the shorter idler stack in the outside hole on the idler mount.
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For the front idler, the stack for the inside bolt is the tall stack. Turn a bolt upside down and install (3) M5 washers, then (1) M5 shim. Next add the 20T idler, then lastly (1) M5 shim.
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Install the taller idler stack in the inside hole on the idler mount.
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The rear idler mount is assembled the same way as the front, however the orientation of the two shoulder bolts is reversed.
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Attach the front idler mount to the left side of the top of the frame using (4) M3 x 8 socket head screws. Don't overtighten them - you'll need to be able to adjust the position of the idler mount to align the belts later.
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Attach the rear idler mount to the rear left top of the frame using (4) M3 x 8 socket head screws. Don't overtighten them - you'll need to be able to adjust the position of the idler mount to align the belts later.
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