At this point, you should have the trapezoid shape. Then, connect the parallel lines together. The parallel distance between the lines should be the length of your part. When you sketch the splines, they should be parallel to each other.
Not sure if you know this, but you can right click the spline and get the exact measurement. To sketch this, you need the length of your part and the measurements of the front and back-end splines. You should not have two curved lines/ splines at the end. This is why your meshmixer shape is incorrect. This is going to be counterintuitive, but the shape you need is a trapezoid. The part I was making was laser cut flat and then formed into the curved shape with a heat gun. You are now ready to edit the object! You can turn the History back on at this point as well.I had a very similar situation for a part I was creating.
Select your split bodies and select OK and it will create the new body. Go to SURFACE section and select MODIFY → Stitch. Repeat above steps if you are still getting too many facets. Right click the object and select MESH to BREP for each body. Move back to the SOLID section to access the MESH to BREP againĥD. If you have to plane cut, MESH->Modify->Plane Cut, and the cut type is split bodyĥC. If the MESH has too many facets, I prefer to plane cut the object into smaller chunks so I don’t need to use the Reduce under MESH->Modify and lose precisionĥB. Right click the object and select Mesh to BREP and the operation is a new bodyĥA. Left side, right click on the unsaved project name “(unsaved)” and click on “Do not capture Design History” and select Continue. Here, then you can reposition, rotate the mesh object and define units, etc. It’s pretty easy and there are a few good Youtube videos on it. I’ve been doing a bit of STL modifications in Fusion 360 lately.
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