Artefacts on overhangs  

RE:

Your either printing too fast or not cooling enough. 

• Slow down, especially outer perimeters, maybe also regular perimeters (regular infill can stay fast, you can also try out the new Prusa Slicer setting of reduced speed specifically at overhangs)
• Reduce hotend temperature, if there is still room for doing so without causing issues like clogging or poor layer adhesion
• Increase cooling if it isn't already maxed out.
• If you have one main overhang, orient that overhang towards your part cooling shroud, where cooling is the strongest. 

RE: Artefacts on overhangs

This function calculates the strength of adhesion between adjacent layersin a 3D printed object. It considers factors such as material properties,printing parameters, and environmental conditions.

RE: Artefacts on overhangs

Hello All,

I have exactly the same issue than you but I'm unable to find anywere the solution.

did anyone else find solution for this?

Posted by: @hiigara

Hi,

 

Just finish the MK3.5 upgrade.

I have artefacts on the overhangs parts of the benchy. I suspect not enough cooling but I can be misktaken.

What's your advice?

RE: Artefacts on overhangs

Hello Thejiral,

I'm using default settings and printing on PLA at 200º/210º. the strange thing is that before upgrade this was not an issue. I'm still missing to test it with other slicer... will check it and leave feedback

RE: Artefacts on overhangs

Hello,

I have had similar problems since upgrading to MK3.5.

I think it is due to the increased print speed due to IS etc.

It also seems to me that the hotend temperature is higher at the same temperature setting as for the MK3S, possibly to allow the higher flow rate required.

I have constructed and printed pyramid dies with 40° and 50° overhang.

On the side facing away from the fan, the print was very poor with the factory settings, after I reduced the temperature from 240 to 230 and set the fan speed to 100% the print was OK.

Regards,

Stefan

RE: Artefacts on overhangs

Just to leave feedback on my development on this subject i did the folowing tests:

1.  Print two benchys at same time
   1. this will increase the time to coll down filament
2. Print 1 benchy with PLA at lower temperatures than normal (180º)
   1. results improved and this show that I had an issue with temperature, or the software is faulty or HW is faulty.
3. After contact prusa support it was recomended for me to test the termistor, guide on page https://help.prusa3d.com/article/multimeter-usage_2117
4. I test the termistor resistance and it give me around 65 Ohm. I also test the headbed termistor resistance and it gave me around 100 Ohm.
   1. with this information My conclusion is that my printer is printing in higher temperatures than expected due to fauly HW. noiw I will replace this part and check the result.

I hope this can help you also, to find your problem.

BR

helder