I noticed on my M200 Plus and on the new M300 Dual that the fan of the electronics does not run properly for the first few minutes after booting. It rattles terribly. There is then the possibility to restart the printer again and again until its fan runs properly, or to knock properly on the table, or to wait a few long minutes.
This cannot be the case with professional printers!
Thanks to plenty of video manuals available in our Support Center - it is not necessary to send the printer to our facility in order to replace most of the parts. You can easily do this on your own.
However, in order to officially submit a warranty claim - you should contact your Reseller (the initial place of purchase) first. In case of any questions or doubts - you can always contact Zortrax through the support form.
Unfortunately I started to experience the same problem only yesterday. Indeed - a poor selection of fans it seems. I will try to revive it but might be getting the noctua fans as well.