Nozzle seems to clog  

Re: Nozzle seems to clog

What material are you printing ? To ensure it' not coming from filament, try with PLA (some from PRUSA if you have).

Did you tried decreasing the max volumetric speed (Filament settings -> Advanced) ?

By default it's 15 mm3/s, which is really to high according to E3D datas, mine is set to 11.

Did you decrease the printing temperature ? Higher temperature helps for better flow

You might need to clean your nozzle if you had several clogs and your nozzle stayed hot a long time without extruding anything.

Re: Nozzle seems to clog

there could be many causes of a problem like this, pictures may help. you don't say which filament type, what settings, whether the printer is in an enclosure, what size nozzle, what extruder, e3dv6, volcano, etc. whether the fan is running, what fan shroud you are using...

If this happens on detailed parts of the print, I would consider reducing the length of retractions. to say 0.6mm or 0.4mm instead of the normal 0.8mm
for starters.

if the filament is getting chewed up, then you may not be getting missed steps.... the clunks may be the filament recoiling as chunks are chewed out!

possibly increasing the filament temperature may keep it more fluid,

maybe slowing the print speed may give more time for the filament to extrude rather than blocking up the nozzle...

perhaps there is some debris in the nozzle and it's moving around with the various filament removal and restoration. actions, perhaps a cold pull, or two will clear this for a while.
regards Joan

Re: Nozzle seems to clog

FYI...I seem to have the darndest time with the festo on the hot end coming loose. I take it out reseat the pfte tube and reassemble it. Click click click again. Check it out again and the collet has come loose again allowing the pfte tube to rise up and down. Maybe on reassembly I'm pressing it against something to loosen it over and over. This last time I took a small stainless steel washer and removed a small section to make a tube clip. I have not had a chance to try again but I'm hoping it will work.

Neal

Re: Nozzle seems to clog

Hi Neal,

there is a trick you can use on the Heatsink liner PTFE tube.

whilst you have the hot end assembly out of the printer to relocate the PTFE Tube, loosen the heatsink about 1/2 turn (Round finned part), on the extruder assembly, then push the PTFE Tube all the way in, and make sure that the Black retaining ring is pulled away from the heatsink while you push the PTFE into the heatbreak, then when all is snug, re tighten the finned heatsink onto the heatbreak, this has the effect of locking the PTFE Tube into the extruder assembly... at this point you can try fitting your washer under the black ring, to prevent movement of the black ring...

and then reassemble the extruder metalwork inside the extruder plastic parts, heat the extruder, load the filament, cross your fingers, and go for a first layer calibration...

best of luck, Joan

oh... check to see if there is any thermally conductive heatsink paste between the heat break and the heat sink, if not, put some there, if you don 't have any to hand, get some, it's not expensive, and add it next time you dissassemble the extruder...

regards Joan