I had previously reported good microfoam with the following steam tip on my Techno:
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However, it has been reported that with the 220V Techno unit, this tip can result in boiler overheating (for which there is a built-in safety cutoff in the Techno) and indeed this did happen with my machine.
As an experiment I drilled a third hole (using a #59 wire size drill), resulting in a third hole of about the same diameter and angle as the other two holes. I found that this tip generates quite good microfoam (better than any other tip I've tried incluing the new Techno 3-hole tip) and I have not had any incident of boiler overheating with the modified tip (I typically steam about 8 oz of milk).
Natw Liskov