I've had my Delta for just over a year now, I've just had many issues trying to connect to my Delta as when I set it up I didn't move it for almost a year then when I decided to move it I had all sort of issues connecting via wifi and usb.
Haha yeah I do many prints at 100 & 50 microns so some prints take up to 30hrs +
Here is a print before I changed the nozzle (Mind you there is some under-extrusion from my S3D settings not calibrated) But I could see the quality of my prints degrading.
(100 Micron layer hieght)
I did this on the new head @ 50 Micron layer height (Currently testing if watertight)
I did have 1 issue where I had PLA leaking out the top of the hotend. I initially thought it was coming out of the side of the nozzle. I had to take most of the tool head apart to clean it up. I think when I was taking the nozzle off, I might have loosened the hotend and PLA was back-flowing through the top of the hot end. Anyway it all works fine now.
These are the nozzles I bought
I also bought this nozzle as I want to start printing with wood, glow, carbon filaments