3D printed helmet issues

Hello everyone! Here I show you some pictures of the print of this helmet form Do3D.com
As you can see there are some issues, mostly on the top of the mask.
First of all I want to notice that one of the first problem was the stability of the supports, as some of the big one on the back/inside the helmet, detached while the print was going.
This is one of the main reason why I’ve experienced all the issues in the pictures.
But please, If you have any advice on how to get that beautiful results I saw on other Snapmaker users posts, let me know.
Any help is more than welcome
Some print settings:

  • Filament type: PLA
  • Bed temperature: 65°C
  • Nozzle temperature: 215°C
  • Print speed: 40mm/s




Maybe your support fell over in the inside.
How much infill did you print in the upper region? - It seems too low infill density.

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I like a bigger brim when my tree supports are that tall. If they get knocked sideways even a bit, they’re useless. Z-Hop When Retracted could also help, but I find the larger brims are usually enough. I like the brim large enough that the support and model brims are connected.

I agree with @xchrisd on the infill. It looks like the upper surface is getting pulled around because it doesn’t have any thing to print onto.

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How much infill do you suggest for this kind/size of prints?

I’ll definitely try your suggestion, actually what happened is that the supports on the back of the mask stopped at a certain point, creating a lot of stringing on the other parts of the print

Hard to say, I mostly print with 20% infill, at least 2 walls and 4-5 bottom and top layers (depending on the layer height, round about 1mm thickness).

I decide the infill density based on the gcode preview..

If you don’t have a good feel for the infill using GCode preview, you could load the model up in an editor and delete the bottom. Then you could experiment printing just the upper dome until you’re happy with the finish.

I only have experience with TinkerCad, but it’s pretty easy to create a large negative cube to delete part of a model. Once the cube is positioned where you want it, join the two objects together and export.