Hi @ecekt and thanks for your query. The Tobii X2-30 is part of the Tobii Pro business department.
This forum is intended for support with the Tobii Tech Consumer level eye trackers (4C, ET5, etc) and their associated SDK’s.
Please get in touch with Tobii Pro Support team directly @ http://www.tobiipro.com/contact/contact-support/ for an
answer to your query, however I do believe they maintain a list of publically available fixation filters that you can download
and integrate into your own code. Best wishes.