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# Layers

Layers [message #86049] Mon, 10 March 2014 21:18 UTC
I know 3D is printed with a sum of layers, my questions are:

What is the thickness of each layer?
If a layer is less than 0,7mm how is possible not to print thin walls in the layer plane/direction?

Re: Layers [message #86051 is a reply to message #86049 ] Mon, 10 March 2014 21:47 UTC
Yes, the layers are thinner than 0.7mm I don't know exactly what the layer thickness is, but let us assume that it's at 0.1mm

Based on a LOT of experience, they found that fewer than 7 layers (7 x 0.1mm = 0.7mm) tends to break too easily - even while still inside of the printer.

Think of your standard ink-jet printer. As the head moves left and right, there is a small bit of friction, and the paper tends to shift under it.

If you print a super-thin peice inside of a 3d printer, it would have the same general action... friction against the print head would allow it to go "surfing" within the printer - causing the piece to shift out of position, and possibly even cause the print head to "bump" as it prints the next layer.. that can cause a distortion across the whole batch.

Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: Layers [message #86129 is a reply to message #86051 ] Wed, 12 March 2014 13:07 UTC
 stonysmith wrote on Mon, 10 March 2014 21:47 Based on a LOT of experience, they found that fewer than 7 layers (7 x 0.1mm = 0.7mm) tends to break too easily

I understand this argument. You also need to take out the model, clean it, and ship it, and in every step of the process it may break.

 Quote: even while still inside of the printer.

Here my understanding ends. After all, every model will be very thin temporarily during printing.

 Quote: friction against the print head

What friction? I would be surprised if the SLS print head gets in contact with the model. Well, that thing distributing powder, of course, causes friction.

[Updated on: Wed, 12 March 2014 14:15 UTC]

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