Rough sounding noise when starting to cut

The database the community has developed is a great place to search for answers, click the magnifying glass in the upper right corner.
Here is one search result with official advice. (assuming the fan is your problem)

Some users have been able to clean it by using a solvent like alcohol and Q-tips reaching into the back corner. Difficult to reach, and not easy. If you have a pro unit it’s more difficult because of the peltier cooler in front of the fan.

I personally elected to Remove the top left glass top for access. That thread has the details.

Again, that’s assuming the noise you hear is caused by a dirty fan.
You may want to wait for official support to recommend a course of action. Good Luck!