Launchpad for "Rocket sprinkler"

The whole project is based on and of course compatible to the “sprinkler rocket” by Sevro from Makerworld: https://makerworld.com/en/models/1370364-sprinkler-rocket
The rocket shown in the picture is the slim-rocket from there. 

I wanted to try it with the laminar-flow nozzle from this printables project: https://www.printables.com/model/1315244-laminar-flow-garden-hose-head-mk2
So i needed a custom launchpad to make it fix. 

Other materials required:
For the feet i used “20mm ISO-Rohr” from a hardware store. It is 20mm outer diameter and 17,5mm inner diameter. That fits to the launchpad and the feet. 
 

Launchpad: 
Printed upside down. Sadly needs support for the outer parts, the ring is “needed” to place the rockets easily centered. 
If you don't want to use supports, you can probably cut the model below the ring, print two parts and glue them together. 
The nozzle hole in the middle is 39x39mm. Ideally the nozzle should be only a bit smaller to make the outlet stay centered. 
The screw holes on the sides are 5,5mm in diameter so you can use any kind of M6 threads to fixate any nozzle. 

Foot Screw and Nut:
No special requirements on how to print them. 
How good the threads fit together depends on the accuracy of your printer, but they are intentionally not tuned too tight. 

Simple Nozzle:
For those who don't want to print the laminar-flow nozzle, this is a simpler and quicker to print nozzle with gardena connector. I printed it laying on the side with supports under the gardena connector and the nozzle tip. 
Probably can be also printed standing on the nozzle tip. Haven't tested this. 
You could also cut it in half, print two parts and glue them together but the gluing might be to weak to withstand the water pressure. 

Laminar flow nozzle tip:
The original outlet with ~8mm diameter produces only low water pressure. Rockets may take off but probably won't fly very high. 
When printing the original laminar flow nozzle add the STL as a part and position it just in the original outlet. 
Update: Probably not required anymore, because the nozzle got updated and with the MK2.1 now supports exchangeable “lenses” to reduce the outlet diameter. And also now variants with already included gardena plug are available.

For the credits: 
For the gardena plug, i used this model: https://www.printables.com/model/3496-gardena-to-g12