Changing Pressure Support Guide

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The pressure you supply to an extruder is one of the most important parameters in pneumatic extrusion bioprinting. As such, you’ll probably want to change your pressure settings a great deal as you optimize your prints and switch between projects. Below, we discuss different pressure change circumstances and how to achieve them.

I want to change the pressure before I start printing.

You can do this from the Extruder Section of the software. For an in-depth look at this section check out the Extruder Section of our article Allevi Bioprint Online. When sending a new set pressure, make sure to wait for the pressure to update in the ‘Current’ pressure window before proceeding with a print.

I want to program different, simultaneous pressures for coaxial printing.

Check out our Coaxial Printing Protocol for instructions on activating simultaneous pressures.

I want to test different pressure levels in a single print.

  • First, pause the print using the pause button in the status bar of the software.
  • Next, navigate to the Extruder section of the software. Some settings will be unavailable but the pressure settings can be altered during the pause.
  • Set your new pressure value in the set window and send the command.
  • Wait for the ‘Current’ window to show the new, correct pressure value.
  • Resume the print.

I want to turn pressure on and off during a print without pausing.

The gcode used to control simultaneous extrusion in coaxial printing can also activate and deactivate a single extruder to achieve this affect. You can find the relevant gcode lines in our Coaxial Printing Protocol. The key difference is that your T commands and P commands should reference the extruder you are actively printing with rather than the auxiliary extruder used in coaxial printing. Also, note that unlike coaxial printing, you can use this technique with the Allevi 1.

Do I need to change pressure levels from the air compressor?

Nope! The pneumatic system in the printer can easily regulate the pressure going to the extruders according to the settings you program from the software. Therefore, you can set up the air compressor to supply the minimum 120 PSI and let it go. In fact, we encourage you not to change the supplied pressure from the air compressor.

If you have any further questions, contact the Allevi Support Team.

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