How to make a small edit to a complex STL file?

[jamieeverall]

Hi all,

I have an STL file which has had some 3D Sculpting done on it, meaning the mesh is very complex.

On the model there are two very simple 23.5diameter circles which i want to make 22mm diameter instead.

Is anyone able to advise the best way to do this - im finding uploading the STL into fusion is causing it to slow dramatically or crash altogether.

Thanks

[TheCADWhisperer]

There are no circles in a stl. None. Only lines.

Can you Attach your original stl file here?

[jamieeverall]

-

[jamieeverall]

Right ok - so there are two areas where lines form a circle on this design, ive called these out in the screenshot i provided. these are recesses for candlesticks. the diameter of each is 23.5mm and i would like to reduce to 22mm.

The stl file is pretty complex which is pushing the filesize above the 71MB allowance unfortunately - are you able to advise another way to upload?

[davebYYPCU]

In an earlier question you had a Fusion model file, 

edit that set of holes, and Save the result As Mesh.

You can also Model an Insert, concert to mesh with tessellate and then merge them, not sure of the terminology.

Might help.....

[jamieeverall]

This sounds a little more advanced than what im capable of im afraid. are you able to add some more direction on how i can do this?

I have taken the original file which was made in Fusion 360 and i have made the diameter of the holes 22mm as desired. Are you saying i am able to merge this file now with the STL file?

Thanks,

[davebYYPCU]

Discard the old STL, with the edited file, Save new STL.  (preferred workflow)

the other option is way more difficult, but could be done that way without a fusion file to edit.

Might help.....

[jamieeverall]

The issue is - i cannot discard the STL file as it has had work done to it in ZBrush.

I have attached screenshots of the diffrence between the STL files.

So basically. I need to edit the STL file that has the texture on it to make the holes 22mm in diameter. But the file is very large and has over 10,000 triangles. So editing it is proving difficult.

[davebYYPCU]

Meaning the Zbrush won’t load into Fusion?

Then take new model into Z brush and fix it.

Might help...

[etfrench]

How will this be manufactured?  If 3d printed, then it's not necessary to edit the stl.

[jamieeverall]

Hi, yes it will be SLS printed.

I need the holes at the top to be 22mm and they are currently 23.5mm.

How is it not necessary to edit the stl file in this case?

[etfrench]

Create a cylinder with outside diameter of 24mm and inside diameter of 22 and with a height slightly more than the depth of the hole.  Combine them in the slicer.