Hi,
I have been having the same problem where the water had been smashing the seedlings as the drops coming out were just too big.
I have come up with a solution that is working pretty well.
I took the water hose off the UTM and attached it to an irrigation riser with a misting nozzle installed. The riser happened to fit perfectly inside the hose. You can also use it with other types of nozzles.
I 3D printed a simple part to hold the riser in place and attached it to the Z axis aluminium extrusion.
It was windy the day I tested it but it works very well when turning on and off between plants, watering only the targeted plant.
X axis offset = 30
Y aixs offset = -50
If you want to use this design, contact me and I’ll send the STL file.
Regards,
Mark