hot end touching the print and deforming it

[justprintit]

Hi!

Using Repetier Host /w Slis3r RostockMAX ABS 1.75 @ 220c heat bed 70c 0.2 layers, w/retract
I can see the nozzle in hotend touching the print and it looks mushy.
cooling helps, i even went as far as hooking up air compressor.......

It seems to print fine until part becomes narrower, under 1cm area, and then begins to fail to building up as tower, and turns into an impotent banana..
Please help!


Thank you for reading.

[edward]

Well you are on to it...cooling is what you need. If it reaches a corner and just kind of drags the extruded filament around instead of creating a sharp corner, you need airflow.

I know you said you have a compressor attached, but the tops of your prints want more cooling.

[Glacian22]

I had the same problem, and cooling is the solution. Not just having a fan cooling your print, but also having the hotend move away so it can cool off. If I want to print something with a delicate top, I'll print something else at the same time.

[justprintit]

oh ,thank you edward and Glacian22!!!

Glacian what do you mean "print something else at same time" as in other peaks of your part?

Also, when you say that moving hotend away -while retract?

Should I be also playing with flow/speed control multiplier while print?

Thanks.

[edward]

No, don't touch the flow or feed setting.

I've never tried the two item strategy, but it sounds good.

[Glacian22]

Basically, if I'm printing an object that has a pointy top where the hotend will have to stay in the same area for a long time, that area overheats and turns to mush, like in your pictures. But if I print two of the object at once, then the hotend will have to jump away from the problem area, letting it cool off a little. If you're using Kisslicer, it has an option called "prime pillar" which has your printer build a small hollow cylinder off to the side of whatever you're actually trying to print. This serves the same purpose of making the hotend jump away from your overheating model. This is really handy, especially when you don't have two things you want to print at once.

[justprintit]

oh, that prime pillar" sounds great! I am gonna try Kisslicer, never used it before.

Thanks Glacian!