I've got an idea, but don't know how feasible it would be.
Have a top assembly made with a cone, spider, and basket.
Figure out a good way to make a coil removable. You've got a 3-D printer and are a problem solver. You can probably come up with a better way to do this than me
I'd say print a ring (like an adapter that makes a smaller coil fit snugly in the hole of a cone and spider that have a larger opening). Then figure out a way to make the coil secure, but easily removable.
I'd say use something like Fi's FOAD leads, so they aren't attached to the spider (unless you'd want to solder and de-solder leads to each coil you tested).
Have a radial Neo motor to bolt the top assembly onto. That way, you don't have to tediously clean the gap each time you slinky a coil. Traditional ferrite motors would be a pain.
Hopefully this helps
My Silverado: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Four VP 7k's. B-pillar 4th order and 8 15" Soundrive subs