Creating a hollow shell from a Ear Impression

[mansimaraneja]

Hi ,

I am trying to get create a shell from a model of ear impresson ( attached right ear - 047049-80 AA_R) . The shell thickness must be 1.5 mm . I have been able to plane cut , smoothen and modify the surface as needed (attached - soundlink-left). However, I am ready struggling with creating of the shell . I tried to Use Hollow and then separate shells but get an error , no multiple shells found.

Would really appreciate some suggestions on what can be the right workflow for the creating a shell for the model attached. 

The overall objective is that we will then print the shell and the electronics for a In the Ear hearing aid.

Thank you in advance

Mansi

[hfcandrew · Accepted solution]

I think you want to use select>edit>offset (-1.5mm).

Watch: https://autode.sk/3K7zAs5

[mansimaraneja]

Thank you very much. That really helped speed up the process

The steps are followed are 

1. Select the base  and then Discard it (Select - > Edit - > Discard)

2. Then select>edit>offset (-1.5mm). I also checked Connected . I actually decided to go less than 1.5mm as it looked a bit odd

3. Then remeshed (Select -> Edit -> Remesh)

Attached is the modified model

I still need some help with a few things. Would really appreciate your help here

1. How do I find out the exact thickess of the model

2. I tried to smoothen and remesh the edge but it still not as good as I would like it to be. Any suggestions

3. What is the best way to extend the edge by 1mm

Thanks again 

Mansi

[hfcandrew]

1) The exact thickness is whatever you set the offset to be. Or you can run Analysis>Thickness to find any thin spots.

2) Use the sculpt tool robust smooth brush

3) Start with a bigger/longer source piece, then do the offset and plane cut the rest up.  OR   Select the bottom rim and transform to pull it to the shape you want, then offset.