I’m modifying an stl head model to serve as a test “phantom” for EEG training where students learn to attach electrodes to the appropriate places. In addition, I plan to place wires to the various sites on the scalp to connect to a signal generator place inside. I have this solid head model. It would be great if I could hollow it out somewhat to make it easier to do the internal wiring and electronics. I’ve played around creating spheres and subtracting them to hollow out the structure. Works OK, but is a bit tedious. I’d appreciate any ideas.
In Blender you would just delete the face at the bottom and reimport it. That would make it hollow very quickly but will not have thickness is that enough?
If you need it thickened you could do that in blender as well.
But if you want to hollow it in Shapr I would slice the head multiple pieces (also in half) so you can use the outline to sketch and finally loft, kinda like this.
If all you want to do is hollow it out, use the Shell tool. Simply select the surface where the cut is, select the Shell tool, and set the shell thickness.
I’ve searched high and low (mainly googling and yegging) and could find anything like this. I am interested in what tools you used to hollow out the solid head. I tried splitting at the neck and using the shell tool, but Shapr3d balked. And I see what you did with adding the addition structure on the face and ears.
Here a proof of concept. Lot’s more to do, such as creating the mounting mechanism.
KYUN,
What slicer are you using? I’m using Bambu Studio, and it won’t let me set the following parameters to 0:
Top paint penetration layers
Bottom paint penetration layers
The resulting slice has these solid elements around the front and sides roughly below the eyebrows:
Thanks for point out this function in the slicer!!!
Mark
My example, was applied to a SOLID STL, so you can apply the setting to your original STL download and it will create wall loop of 10 with bottom opened. It’s .2mm nozzle so you are thickening it to 2mm with 10 wall loops.
So that will get into how thick do you need it? Do you need thicker or thinner than what Alex has done. Alex can provide you with Shapr file to modify the parameters but you can’t open it.
I don’t seem to be able to save an editable file after slicing it to achieve the hollow effect. I need to be able to do further edits to insert panels, create access points for the wiring, and create an internal structure to allow a for a secure attachment a base.
We’re not looking for easy ways 
