After several attempts we have finally been able to finish the extraction system on the KH-3020 laser. From now on lasering works without the stink as well. The duct fan is connected directly to the KH-3020 and switches on as soon as you switch the laser on. The difference is noticeable :-)
We have also purchased a licence for the software LightBurn. It is installed on the computer next to the laser (“burner”). You can log in there with your LDAP user account or alternatively with the guest account (see the sticker on the computer).
Have fun experimenting!