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X400 3D-Printer Manual
Seite 254 /
Revision 367
Stand 08.01.201414:30
Kapitel 7. Troubleshooting›Too little material is printed
© German RepRap GmbH 254 /
Once the function of the end stops has been verified, the cabling has to be checked. Also, the end stops have to
be plugged on the "min" contacts of the Ramps, as those limit the downward movements. The upper restriction
of the movement is preset via the firmware.
7.6. Too little material is printed
At first, it has to be checked whether there is a mechanical problem. If the extruder motor rotates but no material
is coming out of the hot end, the hot end might be blocked. Also, the filament screw might be at fault, so that
it is not conveying material to the hot end. Once the mechanics are checked, the flow rate has to be increased.
In Slic3r, this is adjusted via the item "Extrusion multiplier".
7.7. The printer breaks off printing and stops responding
If the printer breaks off the printing process there are three possible reasons. First, it should be checked whether
the power supply was interrupted. The problem may also be caused by an interruption of the data connection
to the computer, the crashing of a program or a disconnected USB cable.
If neither is the case, it is possible that the Pololu shut down due to overheating. This can easily be validated
by touching the Pololu heat sink. Thirdly, the Ramps fan might not sufficiently cool the Pololus or the
potentiometer may be set too high.
If the potentiometer can not be decreased due to possible step losses, it has to be examined whether the motor
works against an increased resistance, e.g. some misalignment of the rods after moving or bumping the device.
This resistance would have to be eliminated and the potentiometer readjusted afterwards.
7.8. Glue on of the PET-foil bubble-free
To attach the PET-foil bubble-free on the printing bed we advise the following:
moiste the printing bed with water oder window cleaner
apply the PET-Foil on the dampish surface (remove carrier foil from the PET-foil)
displace and absorb the excess fluid (with such as squeegee or check card)
heat up the heated bed (if available) at 30°C until all the fluid is not longer present.
254


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