I modeled a fusion blade bit for my Farsight Enclave commander, based on the conversion by Shas'o Dre on the Advanced Tau Tactica forums.
He used some clear fins from a gundam kit (shared between the Transient Gundam and the Shia Qan[T]) along with the homing beacon from the stealth suit team to make his. I order a transient gundam, but after getting it, didn't want to butcher the whole kit just for those bits, so I designed up parts based on them in fusion 360.
Original concept: http://www.advancedtautactica.com/viewtopic.php?p=317454&sid=9a20d1204d89ec7e2e54094b0d672e28#p317454
100% (tried clear/transparent filament)
Attempted to print them 'clear' with transparent filament, with 100% infil. They came out fairly opaque, will have to see if giving them a smooth coat of resin or the like will clear them up any.