An easier to print version of the original Gardena to HDMI connector created by https://www.thingiverse.com/SjorsZuidema.
Printed from the HDMI side towards the Gardena side. Please note that there is still some overhang near the top. This can be resolved by placing a rubber ring from an official Gardena connector.
If you prefer a watertight sealing between your hose and HDMI cable, apply a rubber ring from an original Gardena water hose connector.