The attached .pdf file is simply a list of links to upgrades of the MakerBot Replicator that are (mostly) found on Thingiverse.While I love Thingiverse, it is sometimes impossible to find something you've seen before, regardless of search options. This list just puts all of the Replicator upgrades in one place.The list is in some rough categories, and items are simply chronological within those categories. No attempt is made to judge the usefulness of any entry, though the list makes it easier to compare items and judge for yourself.The d##### included with some entries is the derivative ancestor number(s).While I will probably update the list here occasionally, I intend to keep the list updated at least weekly at: http://www.eeweb.com/blog/gary_crowell/makerbot-replicator-upgradesNEW LIST UPDATED DEC 2, 2012 The new .pdf file now has the links embedded in the thing titles.NEW LIST UPDATED DEC 9, 2012 The new .pdf file now has the maker's links embedded in their names. I have also started including Rep2 and other 'bots things that look like they may apply to the Replicator.NEW LIST UPDATED DEC 23, 2012 The .doc file is now included with the .pdf.The list is also now implemented as a group of collections - one for each category, with the common prefix of "Replicator Upgrades - ".NEW LIST UPDATED JAN 3, 2013