r3bEL mini User Manual
49
For further issues, you will need to use the Arduino IDE to
troubleshoot:
1. With the power to the printer turned off, connect the
controller board to your computer.
2. Select the “Arduino Due (Native USB Port)” from the list
of board (Tools > Board).
3. Select the correct COM port (Tools > Port).
4. Open the Serial Monitor and check that the Baudrate is
set to 115200
5. Using the command line, enter M105 (upper case M)
- The response should be similar to this:
“ok T:22.3 B:21.5”
6. If you received a response, then the printer and
computer are communicating.
Extruder does not retract
or extrude
If you pause or stop a print in the middle of its run, the printer
settings can sometimes be in the relative rather than absolute
mode, so it may not respond accordingly when you press the
retract or extrude button. Simply reset the printer settings by
using the command M83. Type M83 on the command line and
press send.
Droplet “skidding” across
Petri dish after it is printed
If you observe water droplets skidding across the petri dish after
it is being printed, first check and see if the table surface where
the printer is sitting on is flat. Next check to make sure that the
table is stable. We highly recommend that the printer is placed on
a fixed table and not one on wheels or movable.
If you run into “misprint” issues i.e. one or more droplets in the
run did not get printed, it may be a needle issue due to a clogged
or dirty needle. Remove old needle and use a new one. Calibrate
new Z0 again before starting the new print.
You should also check that there are no air bubbles in your
syringe. If there is, turn your syringe upside down with needle
facing up toward the ceiling and slowly push out the air bubble.
Repeat priming step to ensure you have a tiny bulb of liquid at the
tip of your needle before you begin, the run the protocol again.
If problem persists, you can try to make adjustments on the
protocol itself depending on what the actual problem is. We
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