First layer is okay. Next layer has gaps????  

RE: First layer is okay. Next layer has gaps????

The bondtech gears might be slipping with the higher speeds on second layer if it has too low pressure on the filament

RISPONDI: First layer is okay. Next layer has gaps????

... or the tension between the spool and the extruder is too high.

It is clearly under extrusion.  Do you have also the MMU ?

Regards

RE:

I have the same problem. Everything worked before the Upgrade from MK3S+ with MMU. The problem gets worse, the less filament is extruded and better (but not solved ) when the temp is reduced (down to 205°C in my case). 

Printing speeds do not significantly differ from MK3S+ in my test scenario. 

Tried this:

- adjusted idler screw tension in both directions

- dried my filament

- reduced speed

- higher temp

- reduced temp

- rerunned temp calibration

- readjusted Z-Adjust

- finetuned bedlevel

- inspected Bondtech gears and teeth

- shortened filament path and reduced friction to absolute minimum

- tried different profiles (MK3.5 single profile and MK3.5 with MMU profile and my MK3S+ with MMU filament profiles)

- tried other filaments

- cold pulls

- changed nozzle

I have no idea what to try next. Revo hotend/high flow nozzle? But why isn't one in the packet if needed? With the extra money for this I could almost have had a 3.9...

@andypants : could you get it to work? How?

RE: First layer is okay. Next layer has gaps????

Does it happens everywhere in the bed or is it always in the same spots?

Try to z level, and use this guide (step 10-18) to check the bed, i had a problem like this with my mk3s+ and i fixed it installing the nylock mod.

RE: First layer is okay. Next layer has gaps????

Now have again finetuned my bedlevel and Z-adjust. 

First layer looks absolutely fine. Perhaps a little bit of linear advance finetuning could make it even better. But it should not interfere with following layers.

The second layer still has gaps inbetween. I think through the whole layer. It looks not exactly like above (not any more). Now it looks like there is constantly not enough flow so the neighboring lines do not connect. Third layer again is perfect.