Tall pieces adesion
Hi everyone, I am printing some terrain for my tabletop games and as you can see they are coming out pretty good. They are almost 20cm tall and have a narrow base but a few were printed without issues.
This morning, anyway, after more than 10 hour print and 13 minutes left, two pieces detached (I guess one detached and touched the other one) and the print was not completed perfectly. Luckily I was printing ruins, so I will be able to use them with some modelling hack.
My question is, was I just lucky with the pieces that were able to complete? Should I change brim for raft? Do you think is normal having this problem with this kind of size pieces?
Thanks.
RE: Tall pieces adesion
Maybe some info, it is pla on smooth sheet.
RE: Tall pieces adesion
Don't use a raft, that will not be as good adhesion as a brim. Like every instance of parts detaching be absolutely sure that the print surface is clean and free from any oils (especially finger oils from handling). Clean it with hot water and basic dish soap as described in many many other posts. Also make sure of your z height adjustment is bang on.
PLA on a properly clean smooth sheet with a correct z height should have no problems sticking even with relatively small contact areas.
For example -
I have printed that part multiple times with no detaching. The contact area is smaller than it looks too as the first layer has a 6mm square hole for a switch in there.
RE: Tall pieces adesion
That is quite impressive, thanks, I will try again, maybe my z is to high, what confuse me is that for 10 hours everything was fine.
RE: Tall pieces adesion
Z height must be dead on for this type of print and consider a brim.
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Chuck H
3D Printer Review Blog
RE: Tall pieces adesion
@theolderbear
Those little cornices/details on the gothic windows will have a tendency to curl up as they cool. When the printer passes over for the next layer it will bump them. If the adhesion is only 'ok' then they will detach. If the adhesion is great it will just iron right over them and continue.
Next time you print one just listen to the printer. I'm betting you will hear a slight catching noise when it gets to them. I've had similar in the past where I was printing a carry handle, so basically a arched section at the top. Its a worrying noise but if you get the bed proper it will just continue.
If you dont mind posting the model then someone could do a print and check on a different machine too.
RE: Tall pieces adesion
@Neophyl thanks for your offer, but is a proprietary model and I think would be not correct form me to share it.
🤫 I just realized that when I made the successful prints I had a different Z height, i had torepeatt the process for a stupid mistake, so I think that I will lower it a little bit 👍
RE: Tall pieces adesion
@theolderbear
Yeah don't post proprietary models publicly.
The PINDA probe used to detect the steel print surface and so set the correct distance is also temperature sensitive. So actual z height can be different depending on if you have just started printing or are doing a repeated print. One thing many of us do is modify the start gcode sequence to preheat the build plate and let it warm up all over as well as warm the pinda probe up with the bed. This gives a much more consistent levelling process. I haven't had to touch mine for months, even when it got really cold.
Bob has some really good notes on this if you want to try it (and dont use it already). They are located here https://projects.ttlexceeded.com/3dprinting_prusaslicer_start_gcode.html
RE: Tall pieces adesion
@theolderbear
Yeah don't post proprietary models publicly.
That will keep you out of trouble.
--------------------
Chuck H
3D Printer Review Blog
RE: Tall pieces adesion
@theolderbear
When they tipped over did the brim come with them?
It's hard to be certain from the pictures but it looks like you have elephant's foot compensation turned on; in which case the model will not join properly with the brim. So turn off elephant's foot compensation and try again with the same brim.
Hth, Cheerio,
RE: Tall pieces adesion
So, I think my issue are gone 😀 . I just lowered a little bit the z height and I was able to print this one without brim, thanks everyone!
RE: Tall pieces adesion
Hi, printed a lot of different stuff without issue but got another failed print today....
I was in the room and heard a strange noise from printer, like something was bumping on something, I stood there and after some time happened again. The nozzle was kind of bumping on the top of the object that off course lost adhesion to the print bed 😥 . What could have been the issue? Maybe the object was already detached a little bit?
As you can see there is a kind of mark now on the bed, z height too low or can be normal?
RE: Tall pieces adesion
I read a little bit around and I think my z is to low now.