In case you want to keep using the rail system (U2RS) and want to upgrade to the new + feeder I published a simple bracket. Upgrading is pretty easy, specially when you reuse the feeder motor. Get all parts for the feeder at your local distributor. Your feeder motor needs to have the D-shaped axis to be able to reuse it. - get the feeder parts at you local reseller. - Print the bracket - Mount the feeder (when you reuse it, you have to cut about 8mm off the axis off the old motor, or use a thicker mounting plate), you need 4x M3x10 to mount the motor Upgrade the firmware to Tinker 16.03.1 https://github.com/TinkerGnome/Ultimaker2Marlin/releases Change the e steps from E282 to E564, with the fantastic @tinkergnome firmware you do this in preferences/motion settings. link to rail system; https://www.youmagine.com/designs/ultimaker2-rail-system-u2rs