Ok, so all you want is print the borders of a stl file? That is actually pretty simple and just needs correct slicer configuration. Important setting to make solids hollow and only print walls:
- Number top/bottom layers must be 0
- Infill density 0%
- Select number perimeter like you want. One turn or 2 or 3.
- No raft required on most printers
Make solid as high as you want printout.
No tricks required.