I plan to launch a Kickstarter campaign for the Zatsit delta kit very soon.
The kit includes an ultra-simple and ultra-light water-cooled hot-end adapter that can be purchased separately.
It is shown on the photo, with its support, specific to Zatsit, but it can be adapted to any situation. I think it's the lightest Hot-End on the market, and it can, indeed, improve machines with little power, or suffering from ringing, due to excessive inertia of the Hot-End.
Video (in French) here : [
vimeo.com]