Honeycomb infill


#1

Hi. I know about Formware’s lattice infill but its not really what I’m after. I would like a honeycomb infill function that can do this:

This is done on a solid model. There are options for shell thickness, density and width of the infill. What’s great also is the option to have an open bottom as shown in this example. It eliminates the need to add drain holes and the models are much easier to wash after.


#2

Hi,

It looks to me like this is only some kind of base plate right? It seems to stop after a fixed height?

Or is it actually an entire infill?

elco


#3

Hi Elco,

No it’s ther entire infill, from the shell down to the bottom.


#4

Hi,

So just to be clear;
it generates:

  1. the wall from the model down to the platform
  2. the honeycomb infill (which is only a couple of mm heigh and then stops)
    Don’t you get an unsupported inside then?

Are you able to email me a sample .stl of what is generated? info@… is fine.

I can have a look if we can implement it.

Elco


#5

Hi Elco,

No the infill is not just a few mm high, it occupies the entire space inside of the shell. I think the difference is that, unlike the lattice infill function, which ads material (the lattices) inside an already hollow model, this function starts with a solid model and substracts material in hexagonal shapes. I’m unable to send you an stl file because this function is done in the same step as slicing. If it’s still unclear, I can upload more screenshots of the print preview with the layer slider at layer 1, halfway up and 3/4 of the way up the model. Thank you.


#6

Yes please send some more screenshot then. I can’t exactly tell.

below:

  • red is a vertical extrusion from the contour of the entire mesh, or at least the edge. I assume this is from 3d scane data; extruded vertical downward.
    This is then offset with a width inside.

  • green: thickness of the honeycomb

  • blue: height of the honeycomb. This stops right? You can see the inside of the mesh further up


#7

Hi,

Yes, in this example, the mesh outline was indeed extruded downward to the base. But that is not part of the infill function. It is a separate function of the slicing software that was used (FlashDental) which enables to create a basic solid dental model from a 3D scan.

Yes, the thickness of the honeycomb (in green) is set by the user in the infill function.

Ok, now I understand why you think that the honeycomb stops short. It is because that is the shape of the model. This is an upper jaw so where the honeycomb stops is actually the concavity of the palate (the roof of the mouth), which happens to be quite close to the base. Maybe these screenshots can help (notice position of the layer slider on the left).


#8

What you want isn’t an ‘infill’ but an ‘Create honeycomb base’


#9

Yes it’s probably better called a ‘base’.

However it’s clear to me what the use case is.

@crapshoot do you have an example 3d scan file that you import in flashforge dental? It looks like they import a point cloud or an open mesh surface for the top?
I could have a look if I can create the same workflow.

As a matter of fact; one of our spanisch OEm partners already asked for a vertical extrusion some time ago. So it was already on my todo-list to add this. Might as well take the honeycomb along.

Elco


#10

The function to create a base from an open mesh is a separate function from the infill function entirely. Here is another example of using the infill function but on a calibration cube stl. When you set the density below 100% you automatically get the honeycomb infill. The % you set determines the density of the cells. If you set it to 0% you get a hollowed out model. When you set Hollow Base to Yes, you get an open bottom. If you set it to No, the bottom of the model remains intact.

The base generation is a separate function of the software.

You import an open mesh:

Select Generate Base:

Set the height of the base, set if it is an upper or a lower jaw and set if you want the walls of the base to be smooth or not:

…and you get a closed model:

From there you can use the infill function to either hollow out the model or have a honeycomb infill.

You can do this with any open mesh. Below, I took the cube, cut out the bottom to make it open and used the generate base function to have a 6mm base added:

In dentistry, the honeycomb infill is handy to have when you need to mount the models on an articulator. The disadvantage in the way this software generates the hollowing out or honeycomb infill is that it is done at the slicing stage, so you cannot save the altered model as an stl like you can in Formware.