This topic contains 7 replies, has 3 voices, and was last updated by 
Shaun 6 months ago.
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Hey all,
Can anyone give me a hand with this? The statue in my profile suffered the same problem. I printed Marvin at the Fine setting, and his keychain hole got melted. Do I need to add an antenna to the top of the model to get the nozzle to avoid melting things?
@saiken I prefer to print multiple models at the same time, one at one end of the bed and one at the other, to prevent this issue. You need to give the layers time to cool before the next layer gets deposited. Most of the time, the rapid from one end of the bed to the other should give it time to cool. If not, you may need to add a larger part to the print bed while printing the small detailed parts.
I operate two Betas and one Production Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben@bhudson I tried printing two Marvs at once on opposite sides of the bed (on the x axis). It’s a little better, but still not great. I noticed that the print head slows way down for the key ring of this model. Maybe it’s partly a slicer issue.
@saiken The slow-down is on purpose. If you look at the slicer settings, it will show that the print speed drops for layers that take less than a certain time value to print. This is what you are seeing. The goal is to increase the time it takes on those detail layers. Usually I will print something large with a lot of perimeters or infill next to a smaller part with detail for this reason. The time taken on the larger part helps solve the issue. The other trick is to print two more parts than you need, since the next layer will start in the same location as the previous one ends. Having two extras means the one in the middle timewise will have the greatest chance of getting a good quality result.
I operate two Betas and one Production Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/benI often find that for small parts i can often print multiple copies without adding much to the total print time.
I think the main advantage is in moving the radiated heat if the head away from the object. Slowing down only helps so much if the head is hovering around the same region generating heat.
The other thing to try is a different material. PLA stays fluid for a large range of temperatures so needs longer to cool than most other materials.
If we’re finding a way around the behaviour, it would seem that it is incorrect behaviour. It doesn’t seem like this is ever the appropriate action; indeed it should do a bit, move away, do a bit more.
This is all academic, as this isn’t the Cura forums, but I’m curious to know.
Its a corner case. You could create some special behaviour to deal with this, but sods law is that someone will discover some other corner case that demands exactly the opposite behavoir.
3d printing is engineering and engineering is all about compromises. You dont notice them for injection moulded parts because you are so used to seeing them, but when you know what your looking for you can see all sorts of design details i. Every product with the sole purpose of mitagating the unwanted behaviours of injection moulding. We tend to think that we can 3d print anything but sometimes we need to adapt our behaviours to suit the process and stop wasting time trying to get the process to adapt to us.
Whatever you do with this problem the solution requires you to slow down one way or another. You might as well sieze the opportunity to print another object at the same time.
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