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If your print head crashes into the print bed during calibration, it is possibly due to the nozzle not being lower than the fan. Below are images depicting this.
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Correct Nozzle Height | Nozzle height too low |
If the nozzle height is too low, it could be the fan is falling out of its position. Simply push it back up and apply a small amount of super glue.
Or you can unscrew the nozzle a little bit in order to get the nozzle tip to the correct position