Posted by: @kvriend

I'm in touch with Prusa Support, unfortunately it takes quite a while to get a reaction. So far no luck. I am considering sending the printer back under warranty as it doesn't function as intended.

Can you run the manual belt calibration and check the belt tension? It could be they are too loose. 

after printing something smaller without problems it seems I’m back again to square one when I tried something bigger. Could it be underextrusion? I’m considering either getting a new nozzle to try (and using them exclusively for one type of plastic only) or getting in touch with customer service, since I have to throw away so much wasted filament so often. That’s not normal right? 
(Closer image in next reply, typing from my phone now so only one attachment per post allowed)

Cheerio,

Posted by: @diem

According to: https://www.printables.com/model/1167816-core-one-printable-parts/files

Recommended material: PCCF

But you would probably do better in two stages, one in PETG to get a slightly better air flow followed by the working copy in PCCF - and with that, print another for the spares box.

Cheerio,

Posted by: @conrad-2

I can't tell exactly but it sounds like you aren't slicing the models yourself. IMO, slicing is printer-specific and I'd never try to print anything, save for a premade temperature tower, that I didn't slice myself. That way I know it's sliced for my nozzle, my filament and the speed and temperature I want. Print success should be near 100% for most things, though I admit to a lot of redesign before I'm happy with anything.

Hi! I usually  slice the models I print myself, sometimes I print via the Prusa app with easyprint, which has more limited slicing options afaik than the desktop application. Ideally the success rate is higher indeed. Hopefully I can get closer to 100%.

Recommended material: PCCF

But you would probably do better in two stages, one in PETG to get a slightly better air flow followed by the working copy in PCCF - and with that, print another for the spares box.

Cheerio,

Posted by: @kvriend

This was with the default 0.4mm nozzle. Not sure what you mean by "separate from the heat break tube", it's one of those long nozzles with a copper bit attached. 

There are 2 types of nozzles compatible with the Nextruder. There is the "standard" setup where the nozzle is attached to the heatbreak tube and the "V6" setup where the heatbreak tube and nozzle are separate. In the later case both screw into the heatblock. Care needs to be taken that the nozzle is tightened only when it is hot otherwise filament can leak out and create a "blob of doom."