Section 3.3 Assembly of the XZ Unit Mounting the Timing Belt
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Put the bearing onto the M4 screw with a Belt Guiding Disc on both sides
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Make sure that the little notch of the discs is facing the bearing. The smooth surface is facing outwards.
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Lead the timing belt throught the opening of the X-Idler holder.
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Put the bearing assembly throught the loop
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Pull it back into the X-Idler holder.
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You just slide in the idler bearing with screw from the side. No need to screw anything, the tension of the belt will keep the bearing in its place.
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Push one end of the timing belt into the teeth of the X-Axis
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Lead the remaining long side through the opening underneath the Teeth.
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Loosen the screws of the X-Motor a little bit, and slide the motor some millimeters in the direction of the X-Carriage.
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Lead the timing belt over the motor pulley
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Lead it back into the direction of the X-Carriage.
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Put the Belt Tensioner on the belt as shown.
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Push the remaining end of the timing belt into the X-Teeth.
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Set the tension not too tight.
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Tighten the timing belt by sliding the motor to the right and fix it again with its screws.
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If the belt moves up and down a little when you move the X-Carriage the belt is too loose
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If the belt makes sound like a guitar string, it is too tight.
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If the belt tensioner is (almost) straight as shown the tension is right.
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Mount the end-stop and with its cover onto the Z-Endstop holder with the Torx screws.
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Be carefull to not tighten the screws too much.
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Mount the Z-Endstop assembly onto the backside of the aluminium frame in the most upper position.
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Mount the Z-Endstop in the upper position as shown below.
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Put the rubber strip to the bottom of the XZ-Frame with some drips of super glue.