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Hi Makarov_sl. Thanks a lot for your feedback.
Due to not owning an E3D-hotend I'm not 100% sure about what you mean with "bigger inlet". I assume you're talking about the push-fit bowden connector. The connectors used in my design have an outer diameter of 5mm. You mentioned your connector has OD 1/8" (3.175mm) and therefore is smaller. Are you sure about the size of your connector?