My guess would be that the tension is too tight on the material in the feeder, causing it to catch on the material and/or grind it down so it can't extrude or it snaps. See if you can loosen the tension spring. That might be what the clicking sound is.
Are you using Ultimaker cleaning filament when you do the core cleaning? If not i would give them a try and do a few cold pulls.
Failing that if its a good blockage, you might need to get a 0.4 nozzle needle and when the print core is up to temp, carefully push it up the nozzle from the point of the nozzle to hopefully break the blockage free (you feel you be able to push the needle all the way up into the core) and then do a few cold pulls.Edited by Carla_Birch
Thank you, for all your advice and I have unblocked the nozzle using a thin needle and hot and cold pulls.
how do you un block a BB0.4 nozzle as I think this is block as nothing is coming through and in the feeder box is making a clicking sound as its back feeding. ????????
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