Most filters (especially the 1" and thicker ones) are surprisingly sturdy across most dimensions except for torsion. Thinking about 3D printing, you could prob

Most filters (especially the 1" and thicker ones) are surprisingly sturdy across most dimensions except for torsion. Thinking about 3D printing, you could probably print a nice corner bit, that would hold the corner of 3 filters together and square to each other. That would make the whole assembly easier to put together and seal up with tape.