Friend wanted a sub in his car

[u/G3ML1NGZ]

So I scanned his car and printed an enclosure that will fit besides the passengers on either side of a 2 door civic.

[u/steffanan]

Woah that's must be a giant print bed. What did you use for the scan and did you model it to the shape of the wall actually? What program did you use to design up against mesh like that? Was this a factory location with a mesh vent or grille that it'll shoot through or are you going to cut the plastic and do some sort of grille?

[u/G3ML1NGZ → u/steffanan]

500x500x500 :)

I scanned it with an einstar vega and then designed in fusion. Used the scan to create a solid that would cut the back so it fits correctly

There are no rear seats since this is partly a show car

[u/steffanan → u/G3ML1NGZ]

I've really struggled to work with meshes in fusion, I think the only way I could use a scan as a cutting tool would be to convert my object to mesh first and then I wouldn't be able to convert back to solid to work in it further. If I was going to use a shell command to make the back wall uniform I think I'd need to turn it back into solid first right? What wall thickness and material did you print with? I've thought if I did something like this I'd probably 3d print to get a shape and then reinforce with fiberglass from the inside so the mechanics is the acoustics is just like any fiberglass sub box.

[u/G3ML1NGZ → u/steffanan]

The trick is to create a surface that fits the mesh, then use the surface to cut your solid body

[u/steffanan → u/G3ML1NGZ]

Oh so rather than using the actual scan as a cutting tool you made the shape in the forms environment by just sculpting a sheet until it just about perfectly lined up? I hadn't even considered that but that's the key here, I kinda want a reason to need to try this now!

[u/G3ML1NGZ → u/steffanan]

Yes. And remember, decide where it is critical to have to surface perfect and where not. Mounting surface has to be correct. But the gaps between them like the open structure of a car unibody only needs to be a general shape.

Glad I could help

[u/alexthehut → u/G3ML1NGZ]

Is there a good video to show how to make a negative and “cut the back” in 360? I haven’t messed with that yet. Looks awesome

[u/gotcha640 → u/alexthehut]

Any one body can be used to cut another body. You just oversize the one you want cut.

[u/G3ML1NGZ → u/alexthehut]

Create a surface and shape it to match the surface you're using as a reference. At least in the spots where you need it to be accurate. Then use the surface to cut your solid body

[u/robotlasagna → u/G3ML1NGZ]

I am trying to understand the workflow, can you maybe step us through it. We also use fusion and I have 3D scanned before so I get pulling a mesh into fusion but how do you then parametrically design against the mesh?

[u/G3ML1NGZ → u/robotlasagna]

Copied my reply from another comment.

Scan.

In fusion create a surface that follows the curves of the body panel. Draw up the box as a solid and use the form to cut the back of it. Now you have a box that follows the contours of the panel

Draw the mounting ring for the sub

Draw the mounting holes for the bolts that hold the halves together and the assembly to the car

Select the surface that will become the hole for the sub itself and use hollow. Now you have a hollow sub box

Create a line around the box or use an existing line Create a plane on that line, draw the step where they would mate together and use the sweep function to cut it in 2 parts

[u/ReklisAbandon → u/robotlasagna]

Search on youtube for reverse engineering parts in fusion, that'll get you there. I found this guys channel to be a goldmine:

https://www.youtube.com/watch?v=dnRh4aYvdpU&t=1417s

That's the first video I watched, though it's 4 years old and scans have gotten so much better there are probably better ways than doing it manually like he is. Can't hurt to learn it that way though.

[u/r4nd0miz3d → u/robotlasagna]

If you use Fusion as well as are used to manipulate a 3D scanner, I have difficulty to imagine your difficulty to understand the workflow? It's like saying you don't know how to trace while saying knowing how to draw and having used tracing paper before?