Festool flexible dust extraction adapter to Kärscher dust extractor

I designed a flexible adapter between Festool powertools and my Kärscher WD5 P dust extractor. It works with PETG for round dust extraction fittings, but for example the Deltex has an oval fitting. I printed with 98A TPU using a 0.6 nozzle on a Prusa Mini, and that worked very well with both round and oval fittings.