bearsbeets
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Posts posted by bearsbeets
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On 8/14/2021 at 10:38 AM, geert_2 said:
Up till now I have only printed single-nozzle models, thus with support in the same material as the part, and with older Cura-versions. So I can't really say what is going on here, or what the best option is.
If I had to print it for myself, and if the model and function would allow it, I would redesign it slightly, so it can be printed without supports. By adding 45° angles to the overhanging areas. And I would use a brim (or even custom designed brim) to keep it stable on the bed, to prevent it from being knocked over.
If redesigning would not be possible due to its functionality, I might consider designing custom supports, maybe a mix of free-hanging supports with an interface-layer of PVA? But I don't know if this would work, I never tried it. See the concepts below.
Concept of (almost) free-hanging supports:
As printed (the middle part of the bridge got similar almost free-hanging supports, but they are not shown in the CAD-model above):
After cleaning-up: there is very little damage to the side-walls due to the thin connection-strands, and of course no damage at all to the design at the bottom. For reference: all walls are 1mm thick here:
Concept sketch of basic support structure in PLA, with a dove-tail interface in PVA, so the bottom areas of the real model on top are kept clean. This would give a very stable support base, easy to print in cheap PLA (in case the model is PLA). The dove-tail is to have the support-interface in PVA stick very well to the PLA base. But as said: I don't know if this would work in reality, never tried it yet, but it seems like it should work. 🙂
If you would consider these concepts, do tests on small dedicated test-models, so you don't waste too much time and material. Stay with the printer and watch closely how it prints.
It'd probably be easier for me to try and redesign the file than build a multi-fillament setup unfortunately.
If I get that sort of setup in the future. I will look into your suggestion. For multi-material supports, do you design the internal support structure as well or is that generated? -
I have a part with threading on the bottom and features above features that need support. I have found the only way to get any support for those parts on the top is by enabling support placement "everywhere." However, when I do this support is generated over the threads which I cannot seem to remove with support blockers. I cannot change support settings to be too far from the object otherwise the nylon I am printing with will droop dramatically. I have also tried increasing X/Y distance to make the supports less of an issue with the threads, but I can't make it far enough that it won't interfere with the threads, but will still support the print where it's needed. When print everywhere is enabled, the support walls hug the threads regardless of what settings I change.
I have had this issue on other parts as well where print supports "everywhere" would negatively impact the print quality but had no other option due to an overlap that required support.Any help is appreciated,
Thank you!
Issues with support generation
in UltiMaker Cura
Posted
"I've worked with models with similar features but I've never seen this problem. What Cad software was used to design this and how was the STL file generated? (There were a couple minor problems with the model but a repaired STL sliced exactly the same.)"
These are good questions lol. I could upload the STEP file as well. I do not have an answer to your two questions though.
In that last picture, are you saying that you were able to resolve the issue? What settings did you change?