Hi, thank you for your post.
Lets keep that thought in mind, we all (want to) like Ultimaker!
I think it is pretty unlikely that your nozzle jams, the print cores are very reliable.
Can you upload some photo's from your feeder? What is the tension you have it set now?
Do you have some photo's of your failed prints?
- Why do you want to print at 1mm layer hight?
At lower resolutions you can print faster and more reliable.
With a 0.4mm nozzle, 1mm layer height is probably pushing the limits of what the nozzle can process.
I would recommend to try another print, at something like 200 or 300 microns with the filament that came with the Ultimaker 3.
Curious to hear how that goes!
I should update my profile - I have been using the um3 for a month now.
What layer height, speed and temperature are you printing at?
When you have too much pressure in the head the force that the feeder exerts gets too high and it starts to grind at the feeder. The problem is possibly at the feeder but 95% chance the problem is at the head.
If you print at 1mm layer height (yikes!) you need to keep the speed probably under about 8mm/sec with the .4mm nozzle. Or did you drill out the nozzle larger?
Also check for filament tangles. I have more ideas but lets start with this.
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