Some of our bearings in the Titan Extruder and Titan Aero have been failing due to a series of unfortunate events and we're really sorry about that. We have a solution to fix the problem on the way, and we'll be in a position to issue replacement parts in the next few weeks. Titan products shipping from now on will not be affected because we have a short term fix in place. For the full details, including getting replacements, please refer to our post: https://e3d-online.com/blog/2018/01/22/bearinggate/