How to avoid hardened nozzle and open vent messages - Assembly and first prints troubleshooting https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/ Prusa3D Forum Discussion Board en-US Sun, 14 Jun 2026 00:45:17 +0000 wpForo 60 RE: https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789250 Tue, 14 Apr 2026 10:59:16 +0000  

Posted by: @abenn

Thanks Antonio.  I've checked my PrusaSlicer and I can find no setting for 'abrasive filament' or anything like it.  Filament type is set to 'PLA', which is what I'm using. 

I forgot to mention, in the Prusaslicer main window you have to set the Expert mode (red), right next to your username on the top right corner. Then the option will appear ;) (look at the screenshot)

]]> Assembly and first prints troubleshooting Antonio https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789250 RE: How to avoid hardened nozzle and open vent messages https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789244 Tue, 14 Apr 2026 10:19:24 +0000 Thanks Antonio.  I've checked my PrusaSlicer and I can find no setting for 'abrasive filament' or anything like it.  Filament type is set to 'PLA', which is what I'm using.  But I've just dug down into my CoreOne+ menus and I've found both the options you've mentioned, and changed them.  Thank you 😀 

]]> Assembly and first prints troubleshooting abenn https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789244 RE: How to avoid hardened nozzle and open vent messages https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789233 Tue, 14 Apr 2026 08:40:21 +0000 Hi,

if you have mounted an hardened nozzle and printing with an abrasive filament, you have to go to Settings - Hardware - Toolhead - and enable Hardened Nozzle there
(the exact wording may differ, i'm using another language on my printer).

On Prusaslicer you can also change the setting on the filament tab - advanced - and un-check "Abrasive filament".

About the top vent, there should be an option in the settings but i have CoreOne non+ so i'm not sure 100% where is located.

]]> Assembly and first prints troubleshooting Antonio https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789233 How to avoid hardened nozzle and open vent messages https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789231 Tue, 14 Apr 2026 07:43:42 +0000 Whenever I start a print with my Prusa CoreOne+ I get two messages which I have to cancel:  One is that my gcode is incompatible because I'm not using a hardened nozzle, the other is to ensure that my top vent is open.  Both can be cancelled, but it would be nice not to have to.

I use PrusaSlicer and I see no option to select nozzle type, so is there an option somewhere that I'm missing?

My printer is supposed to have an automatic vent but I don't know how to enable that, so that the vent message won't appear.

]]> Assembly and first prints troubleshooting abenn https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/how-to-avoid-hardened-nozzle-and-open-vent-messages/#post-789231