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I already try to lighten 40mm version. Unfortunately not successfully. Lost about 5% if I can trust 3d Printer Calculator. Problem is that all versions are meant to be printed at 0% infill, but wall thickness is always the same. Shrinking duct connectors does not really help much.
Do you maybe have 0.3mm nozzle? If you do I can change wall thickness to 0.6mm.

Will anyway try your suggestions :)