Hi all
I have 3 ultimaker 2 printers upgraded with Olsson block's and Bondtech extruder's. At least 50% of the time, the machines fail to print the first layer of a new print and i have to abort the print, remove the bowden tube and trim the 'blobby' filament back. Once I've done this, the printer works perfectly . This happens to all three printers.
Its driving me mad... Today I have replaced the bowdens and PTFE couplers on all machines hoping that it would resolve the problem - still does it!
Any thoughts? I'm running out of ideas!