Check this article to avoid first layers underextrusion issues.
We can easily detect an under extrusion issues when the printed model has a lack of material or when simply there is no filament coming out of the hotend. This happens because the printer is not able to supply material correctly, and there are several parts on the printer that can be related to this issue. We’ll look into these in the following article.
If under extrusion is happening during the first layer, make sure that filament is actually coming out of the nozzle. To do so, stop the print job, go to the Filament/Purge menu, preheat the hotend and check if filament is coming out.
If filament is not coming out when performing a purge check the following article.
If filament is coming out correctly, it’s possible that the Z axis is not properly calibrated and the filament is not coming out due to the hotend being too close to the glass.
In this case you can calibrate the printer following the instructions on the attached article, making sure that Z axis is properly calibrated.
Sigma and Sigmax:
Need more tips? Check out our forum community for more info about this
It's important to keep your printer in good shape to make the most out of it. In this chart you can find a list of the extruder maintenance procedures and how frequently these should be done. Maintenance Plan
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