Detailed 0.25mm MK4 problem  

For detail work you need to begin with a machine in top condition, go through the standard maintenance procedures and clean the print sheet scrupulously; then you need filament in top condition, preferably clear, translucent black or grey, the filaments with the least pigment and the filament must be absolutely dry, dry it for twice the usual time.

Then begin with one of the stock profiles, don't change anything until you've seen what stock can do.

Cheerio,

RE: Detailed 0.25mm MK4 problem

Hello Diem,

Thanks for the tip, ill try that.

thanks very much

RE: Detailed 0.25mm MK4 problem

Hello again,

So I tried the rocket reactor from the Prusa files (but smaller). 

I cleaned up the enclosure and used the eSUN cleaning filament to clean the nozzle. I also used Jet black filament which I dried for 10H during the night and then 2H just before printing (at 41°C and via the SUNLU S1). I also put in place a filament filter. 

I did not change any parameter of the 0.07mm preset (except some properties for the supports, and I added a skirt). 

I got this result, which I believe is clearly better than the first tries I got before. Thanks for your advice! 

Although this is quite good, I still have some stringing problems, so I was thinking about doing the same tests, but reducing the temperature and then the speed. Also, I saw that for detailed objects, it was better to reduce the extruder multiplier (not much, around 95%) but is it a good idea or can it cause problems other than underextrusion?

Any advice on this?

Also, does somebody know if there is an available guideline for testing detailed objects? 

Thank you in advance, 

RE:

You're certainly moving in the right direction.  0.07mm layer height is still lowish for 0.25mm nozzle (try it at 0.1mm) and will begin to require higher quality filaments and more careful setting up. 

Try a couple of different filaments.

I would also try printing two models at the same time while slowing down the print slightly - the slow print keeps heat on the model for longer but the second model allows cooling catch up.

Once you find a working combination you can try the finer layer heights with better chance of success.

Cheerio,

RE: Detailed 0.25mm MK4 problem

Thanks for the tip! 

May I ask you if you could advise some filament brands or types?

Btw, I had an idea about changing the parameters of the 0.07mm profile with the values of the 0.05mm pre-input shaping profile (speed, temperature, acceleration,….etc). Do you think it can be a good idea?

Thanks very much again. 

RE: Detailed 0.25mm MK4 problem

Just as a comment to you initial post where you described reducing the temperature to 200°C or less and then you heard clicking noises... that was your filament starting to clog your extruder. This happens with basically all filaments when you hotend temperature is getting too low. The more retractions you have the easier it happens as well. The difference between filament is (even of the same type) at which temperature this starts to occur. Some PLA filaments for example are less prone to it than other but if you go low enough, it will happen to any of them. If you see it happen at a certain hotend temperature, I would stay 5°C above that hotend temperature. You can also optimize retraction settings, which could help against both, stringing and clogging. You still seem to have a bit of a stringing problem, stringing can btw get actually worse when you are slowing down, even though printing slower helps for almost everything else.  

RE: Detailed 0.25mm MK4 problem

Might want to use a neat PLA filament that does not have glitter. Prusament Galaxy Black has some glitter in it and could cause clogging in a 0.25mm nozzle. You can print faster with a lower layer height; if the filament is not extruded quickly enough, it might degrade and then clog the nozzle. Yes, there is a Goldilocks zone and it varies between brands, your specific set up, and objects being printed.

RE: Detailed 0.25mm MK4 problem

Hello,

Thank you for your advices

RE: Detailed 0.25mm MK4 problem

Hello again,

I am back to provide an update on my progress with this project.

First of all, I purchased two additional brands of filament, Esun PLA+ and SUNLU PLA+. I wanted to test them with the reactor object like the previous tests and I dried them around 2 hours at 40°C before printing. So this is the photo of the tests I made. From left to right;

- Prusament Jet black with basic profiles at 220°

-SUNLU PLA+ with PLA general profile which I changed the temp to print at 215°

-ESUN PLA+ with ESUN profile (at 210°C)

-Second test SUNLU PLA+ with PLA general profile (at 200°C)

I was quite satisfied with the SUNLU test, so before the second test I tried a temp tower to know at which temperature this type of PLA printed better, and the results were pretty good at 200°C. So I tried the reactor again at 200°C (shown in the photo above) and while there is some stringing left, it is very thin and it leaves little to no artifacts on the print itself. Also, I was quite satisfied with the quality so I was thinking about sticking to SUNLU PLA+. By the way, I did not change any retraction settings or the printing speed so I will look into it another time to try and get other results.

I also tried the same figurine from before and the results were quite good in my opinion. The only real problem I have left is artifacts left by supports but that is another subject.

Thank you all again for your advice it was really helpful😀