http://www.p3-d.com/aluminum-arm-stiffeners.html
http://www.p3-d.com/replicator-2-thermocouple.html
^ This is good in comparison to the stock extruder drive gear. However compared to the printable version it is a negligible difference.
http://www.amazon.com/BuildTak-Printing-Build-Surface-Rectangle/dp/B00MN5X318/ref=sr_1_8?ie=UTF8&qid=1430753888&sr=8-8&keywords=buildtak
^ These are a bit pricey for a build surface but each sheet will give you literally hundreds of prints.
https://www.simplify3d.com/
^ Worlds greatest slicing software, this is seriously amazing.
My Rep2 at home one has a glass bed upgrade and printed extruder drive and works great.
Be careful removing their thermocouple it is very delicate do not let it get twisted not even a little.