This is a single spout for the Gastroback Advanced Pro G portafilter (also available as Breville BES 860) designed to replace the double spout that ships with the machine.
I've optimized the flow for a smooth, bubble-free output without splashing and stuff. Works quite nice and should fit any portafilter with a M16 fine-pitch thread (DIN 13-5) outlet.
I recommend to print it in a food-safe and high-temp material such like BDP (green-tec) from extrudr. Doesn't need any support but make sure you're using a proper part-cooler for the overhang sections.
BTW: There's a high-res and a low-res version to download. Choose the one that fits your bandwith or export your own custom .stl with the .blend file (you can control the level of detail with the subdivision-surface modifier).
Here's a video of the spout in action:
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