Why I've decided to ditch my UM2 (+) in Ultimaker.com feedback Posted December 21, 2016 I think as soon as we talk about super glue your doing a "Heath Robinson" and a Plastic gear ??? ditch it, and get a Bondtech end of story. I have an UM2 and another machine and I think the UM2 is a lot more refined than I originally thought,, excepting it has some flaws and replacing them is better than getting rid of the machine, the UM2 is a good machine.. Could not agree more. Bondtechs and a bag of PTFE couplers. All my UM2(+)'s are between 3000-5000 hours now. BTW I use a little fan to keep the Bondtechs cool.