How does the Out-Of-Filament (OOF) work

The Out-Of-Filament sensor checks if there is enough filament left to print. When the filament runs out, the sensor sends a signal to the printer and the print pauses. After pausing, the extruder will lift to avoid quality issues on the print. Without a filament out sensor the printer would keep printing even when there is no filament on the spool.

There are some small differences between our printers in number and position of the sensors:

Our newest BigRep ONE has four filament out sensors. Two for each extruder.

An optical sensor can be found directly in the extruder, while the second – mechanical – one, is located on top of the frame, next to the spool holder.

The BigRep Studio has two filament out sensors, one for each extruder.

They can be found in the printer directly over the spool holders.

How do I configure the OOF sensors?

On the advanced settings in the UI you can define:

  • Enable/disable the sensor for each extruder separately
  • Saftly Cooldown Timeout: Time in minutes for the extruders to cool down after the out of filament sensor is triggered.
  • Pause Wait: Defines a position in X and Y to which the extruder will move after the filament out sensor is triggered. Leave it empty if you would like the extruder to stay on the same position.

What should I do when the filament out sensor triggered?

After the filament out sensor is triggered, you will have to remove the remaining filament and introduce new one. The behaviour of the printer is the same as if you would have manually paused a print.

  1. Heat the extruder back to the printing temperature
  2. Move the extruder to a more confortable position if required (never by disabling the motors!)
  3. Remove the remaining filament
  4. Introduce the new filament and extrude 50 – 100 mm
  5. Click on “Resume Print”. The extruder will be moved automatically into the position where it was, and resume the print.

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