Working progress, will do some prints to bring it as low as possible.
Remixed the Hochul Magazine Extensions File by @nnicclaascoupler to make the coupler, he did a great job, so the connection fits perfectly.
Beware, if you connect two Magazines to the coupler like indented they won't come of again easily because they will lock in and there will be no way to push the lock back up.
Update:
so i lowered the profile and shortened it by cutting the end with the holes, I didn't understand their purpose anyway. The “Final Version” now pretty much looks like the coupler I was looking for when remixing the original file.
Will do some prints the next days.
For this kind of print I usually go with PLA+ at 0,2mm LH, 6 walls and 25% infill gyroid (Bambu strength standard protocol)
The author remixed this model.