C2 User Manual, Release 1.0.0
• Note: It is very important to make sure that the print bed is level by adjusting the thumb screws
below the print bed before starting this wizard.
To start, select ‘Utilities’ from the home screen, then select ‘Fine tune offset’. Select the material currently loaded in
the printer. Then the wizard will ask you which corner you’d like to start from. This simply sets where the printer will
start printing out the test lines. You can start from whichever corner you prefer.
Once the printer homes and positions itself to begin testing, you will see a visual reference on the screen to help you
know what to look for in order to find an ideal Z-Offset value.
You will come to the “Adjust Offset” screen, where you can set the adjustment increment, move the bed up or down,
and test the offset. We recommend testing the offset first so you can get a visual reference to fine tune the current
offset. Move the bed up and down with the provided buttons on screen, and test with the ‘test offset’ button to see if it
looks satisfactory.
When you’ve found a satisfactory Z-Offset value, press the forward arrow in the top right corner and select ‘Save’ to
finish the wizard.
3. Replace the build plate adhesion
• After some time, the build plate adhesion can become unsticky and plastic will no longer be able to stick to it.
Replace this with the black tape that came with your printer or order more from our store at www.robo3d.com.
Unpeel the used build tape from the build plate, and replace with a new, fresh piece. Remember to re-calibrate
your offset by selecting the z-offset wizard from the utilities menu.
4. Using a raft
• Make sure to use a raft on all of your parts when preparing your print. This will allow a bigger surface area of
plastic to stick to the bed, and can compensate for a small amount of unlevel bed.
5. Lower fan speed
• If your prints are still curling after the above solutions are attempted, you can try lowering your fan speed to
stop the plastic from cooling too fast and shrinking, causing warping. To do this go into your desktop software
Cura for Robo. Under the settings> speed> fan speed and turn this setting down to 30%.
6. First Layer Height and Width
• Set your first layer height to 0.3mm. This will allow more plastic to flow out of your nozzle, allowing a better
adhesion to your print bed. You can also try making your first layer width of plastic higher. Usually a first layer
width of 1mm is optimal - this will extrude more plastic at a lower layer height to allow more surface area of
plastic bind to the print bed.
4.2 Grinding Noise when Starting a Print
If you are experiencing a grinding noise when trying to start a print, or when your printer is homing, there are some
things to take a look at to make sure your printer hardware is in the right place. Sometimes during shipping or traveling,
some things can come loose, so lets check those.
1. Rods are out of place
34 Chapter 4. Troubleshooting
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