problems of temperature? big blop at the end of prints

[otaolafranc 0]

hello,

 

since quiet some time i have a problem where the last part printed of the parts is like the nozzel go ups in temperature or something.

the thing is that i dont have any spetial configuration, also i am printing in PLA. 210°C with bed of 60° .

i kept a really low speed of printing and travel but it isnt as all over hangs are like that is only at "the end" of the printing, like it change temperature or some configuration at the last slices. 

i tried to re install cura from zero. i have non pluging or anything else...

 

also i need to add one last info, i have printed even the same piece with different results, everytime it has this "blop" but sometimes bigger some times smaller.....

Edited June 13, 2018 by otaolafranc

[gr5 2,173]

Can you show what the top of the model is supposed to look like?  Is that supposed to be a chimney?

 

Also, unrelated, it's good to slow down printing speed but keep travel fast.  150mm/sec minimum.  

 

[otaolafranc 0]

this is the model, i am going to increase the speed to 150  i had 120 for travel. and the printing speed i stayed in the default 60mm/s

 

Edited June 13, 2018 by otaolafranc

[KickahaOta 14]

Welcome to 'Everyone gives you settings to play with." :)
 

If the problem is happening at the highest point of the model, and especially if it only happens with this model (or similar models that come to a point), it may be that the highest layers of the model are printing too quickly -- that there's not enough time for the material to cool before new material gets laid down on top of it, and the peak collapses into a disc as a result. To see if this is it, try changing the "Minimum Layer Time" from the default 5 seconds to 30. (If this turns out to be the issue, a setting of 15 or even 10 may well be fine and will speed up the print.) Also turn on the "Lift Head" setting so that the warm nozzle isn't parked directly on top of the fragile area of the print during the waiting time.