It may be found in The Enclyclopedia Magica, Vol III, P-Z @ page 924.
As this is a 400+ page tome, itself one volume of three similarly sized works with consecutive page numbers and this is but two mere paragraphs out of 1200+ pages, I infer this is fair use, and shall reproduce the entry here, slightly edited for comprehension:
Quill of Copying
A quill is a large feather that can be dipped in ink and used as a writing instrument. Usable only by spellcasters, this quill can be commanded to copy any spell on a scroll. It copies only one spell per week at most. The original scroll must be burned, and the ashes mixed with rare ink (of 1,000 gp cost). The quill is then placed on a blank scroll along with an inkwell containing the prepared ink. Upon command, the quill starts to write, creating two identical spells on the scroll instead of the single original. If the scroll [which was burned] contains two or more spells, only one spell is copied-either the lowest level spell or [if there was more than one spell of the same lowerl level ] a randomly selected spell. The quill cannot copy protection scrolls or any other writing except spell scrolls.
Unfortunately, there is a 25% chance chance per use that the quill suddenly drains of ink, spoiling the entire scroll upon which it is writing. The blot thus created cannot be removed from the parchment by any means but a wish.
D&D Rule Cyclopedia. XP Value, 5,000 GP Value 25,000
Apart from varying the cost of the Quill of Copying, I do not see much reason the Quill cannot be used, as is, in 3/3.5e