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FAQ
Q: Sometimes the extruded filament looks ugly or has a varying diameter:
A: Not homogenous extruded filament can be caused by the following:
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Check the filament quality. Bad quality filament can have a varying diameter from 1.95 to 1.4mm instead of a continuous 1.75mm.
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There is not enough tension on the extruder arm. Increase the tension on the extruder arm a little. Be careful by not to put too much
tension, because the extruder motor can have a hard time turning
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Filament gets stuck somewhere. Check if the feed of filament to the extruder is going without any obstructions.
Q: There is vibration during movement in the y-axis table
A:
For the Y-axis (moving table) this can be prevented by doing one of the following
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Screw the bolts which hold the slider into the printed part less tight. When the screws are mounted too tight, the slider deforms a little,
this could give stick slip behavior.
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Make sure the belt of the y-axis is tensioned properly. It could happen that when tensioning the belt the clamp slips. When this happens,
tighten the clamp more.
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The jerking of the axis could also be because the y-axis stepper drivers should send more power to the y-axis. Try to rotate
the trimpot of the y-axis clockwise a little and see what happens. Too much will give some twitching of the motor, when
that happens turn the screw back a little.
For the X-axis
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Tension the belt properly. Too much tension will give high frequency vibration during a movement.
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Make sure the motors get enough power, try to turn the trimpot clockwise a little.
Q: There is a lot of backlash in the axis-movement:
A: Check the following:
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The belt is tensioned properly
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The set-screw on the motor-pulley is tightened enough
Q: When looking at walls of the printed parts, there are waves noticeable.
A: The reason for this is that the shaft of the motor, z-axis coupling and z-axis rod are not aligned properly. When the z-axis is rotating
there should be a wobble noticeable. Try to do the following:
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Remount the z-axis coupling in the following way.
o
Try to turn the screws at the motor side of the coupling one by one and bit by bit. Each turn should by ¼ turn. Try
to fix it loosely and try to keep the bottom of the coupling parallel to the motor face as good as possible
o
Do the same for the top 2 screws of the coupling.
o
Turn the coupling by hand and see what side the wobble goes when turning. Then try to turn the screws in such a
way that the spindle is moved in the opposite direction of the wobble.
o
When this seems ok, try to move the axis 10 mm up with pronterface. And see if there is still a noticeable wobble.
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The large M8 nut situated in the z-axis carrier part could be too tight in the slot. Try to file the hole out some more so it can
move more freely.
