Ultimaker 2(+) upgrade package Collection by nisker
This is a package of upgrades for Ultimaker 2 or 2+ printers that I've put together.
The upgrades are discussed in detail in this article:
http://nisker.net/projects/Ultimaker2_education_upgrade_package/
for the full package you need this design form thingieverse:
http://www.thingiverse.com/thing:432877