Seeing this post first? Start at part 1.
2: Researching hull blueprints
3: Copying hull blueprints
4: Researching component blueprints
5: Copying component blueprints (you are here)
What is it:
If you own a researched capital component blueprint, you can copy it and sell the copies. However, due to the high volume of copies created you would spend what I consider an unacceptable amount of time dicking about with contracts. I would not consider this a highly passive income method, and only include it here out of a desire to be thorough.
EDIT 2012-8-21: Blake from k162space confirms this in comments.
The lowest priced non-outlier copy in jita is selected for the copy sell price, and 10 copies per month (actually 27.6-ish days, but I'm not going to bother to be precise here) is used to calculate monthly profit and monthly ROI.
High effort, low ROI.
Copy blueprint (10 copies, 5 runs per copy). Sell copies in jita.
EDIT 2012-8-21: Another idea is to assemble your component BPC into packs along with a capital ship blueprint, such that the buyer receives all the BPC required to make a capital ship. Examining this, I found that a rorqual BPC pack sells for 540 million, while buying the same blueprints off contracts only costs 411 million.
After some spreadsheet-fu, and assuming that the BPC pack in question is something which will actually sell, and pretending that the rorqual BPC was the same price as I could find one at the same material level on contracts, I found that this represents an 80% markup for the component BPC. This is almost significant, but it turns out that it only comes to an average monthly ROI on the component blueprints used to 5.5% -- still below the low end of what you can make doing something else which involves much less effort.
Ha ha ha.
This is the end of this post series.