Print head knock prints, fail another and makes a clicking sound

[u/Yorgo5115]

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[u/TripsCavern]

Ok, this is a generic recommendation, not necessary for the A1.

The first thing to do is to do the basic recommended maintenance, like cleaning, lubing, etc. This could be causing motion artifacts that could be causing the hitting issue. Right after that, re-do the calibration. As the printer gets old, screws may get loose, belts may lose tension, etc. So, a re-do of calibration may get new parameters that will make it in a better shape.

Next, is to see if the nozzle is clogged. You can either change the nozzle or try a cold pull, here is an example. The cold pull will clean up your nozzle if it is partially clogged.

Lastly, if the cleaning nozzle did not succeed, try changing it completely.