Hi Folks,
I'm using a J head MK V clone on my mini Kossel that looks great in terms of machining, dimensions and sticking to the proper design (right number of fins on the PEEK etc). It was supplied with two PTFE liners, one for 3mm filament and one for 1.75mm. I'm using 1.75mm PLA to print with and am getting a lot of blobbing and drooling.
There even seem to be times when filament is actually pulled out of the head during a move and one part of a model develops a sort of beard (for instance on the inner edge of the rear fins of "mr jaws" the shark from thingiverse).
It also takes a while to start extruding at the beginning of a print (even though it's drooling nicely while heating up) so the first 10cm of a skirt will be unprinted.
I thought this might be a problem with the melt chamber being too big for the filament and queried the vendor but he claims no complaints from many customers... what does the reprap hive mind say?
Cheers,
Robin.