I've been grinding Illad on Phobos for Miter parts for a while now, and I am only missing the Blueprint now. However, I have had everything else for a while, and despite doing 4-5 more runs beyond that, I still have yet to find the BP. I looked around for a drop table for Lt Lech Kril (he drops the parts, not Vor), but all I can find is that he can drop all of the parts, and nowhere else has them. I would like to find a drop table (that lists what items he can drop, and what their chance of dropping is) so that I can estimate approximately how much longer I have to put up with those d###ed eviscerators -_-. Is there a website that already has one, or is there a way I can create on without doing thousands of runs myself?
Unfortunately, as of Update 10.2 or 10.3, the drop tables have been encrypted. So, you cannot determine specific percentages of drops. However, as the Warframe wiki has indicated, each boss has a unique item which can be only dropped by them. Moreover, each of three factions has a tendency to drop certain mods and crafting materials over others.
Hopefully, this issue will be alleviated when the codex gets released...
I think there was an earlier version of the drop table released by creative crackers around a few weeks ago, but, it probably has become outdated with the recent patches.