Hello, since a few weeks ago I have this problem and I can not find a solution. I have made the maintenance of axes, I have reviewed the endstops, I have disassembled the engines to check if they were in bad condition, but everything seems to be correct.
My problem is that the printer begins to print the first layer and there comes a moment (randomly) where the extruder stays as blocked and produces a sound as if it could not advance. Then it continues printing, but the route has already been discarded and it has left a glob of material. From this moment, the object that was printing will go wrong.