Alright folks,
I have some issues with skipped layers (genuine e3d v6, bowden setup)
What I did so far:
When you say skipped layers, what are you seeing?
Is the entire layer simply missing and the next layer drops into the space where the previous one should have been, leaving you with a poorly adhered layer that looks clearly like a layer that was laid down in too large of a gap? Or is it that the exterior surface looks somewhat lacey where there has been partial but inadequate extrusion (and does that lacey pattern extend through the entire layer)?
@Stephen_Baird missing/deleted image from Google+
Ignore the gap, I pulled it apart on that spot
Cartesian or delta? You say it isn’t skipping steps or grinding, did you check this during the layer it skips? Also check to make sure there’s no filament residue on your drive gear.
It’s hard to tell for sure in the picture, but does that missing exterior layer go around the entire print? Is this being printed with a single perimeter layer?
@Adam_Steinmark yes, there is constant filament flow, the printer is cartesian.
@Stephen_Baird yes, it goes around the entire model once it skips a layer. There are 3 perimeters on this model
Sounds like it could be a priming issue. What program are you using for slicing?
@Blake_Dunham I’m using Simplify3D.
I have the same effect on other models also
Maybe trying bumping up the “extra restart distance”.
I have seen weirdness with simplify3D where a feature in the model that isn’t at a division of the layer height will cause the whole layer to not be generated. Check the “preview”, either zoom in on the model, or used the “end” slider to rewind to that layer, check it is actually trying to print something there.
I have had the same looking problem with a bowden setup, caused by jamming on retractions or drive gear slip. exact issue is the filament is sparse and the cause being some restriction on feed from extruder or flow through nozzle. check filament pathing from the spool, including the spool friction. though i had this a few times from different issues, it’s most often drive gear slipping. is this a one time event or a repeating problem?
that first sarcastic reply you got, unfortunate you have my sympathy
Update: the issue seems to occur at similar layers.
I put out and cleaned the smooth and threaded rods of the Z axis between printing the 2 cubes.
Could it be something with the Z linear bearings?https://plus.google.com/photos/…
missing/deleted image from Google+
Hold up. You said you have constant flow during the skipped layer, the filament has to be going somewhere, you must have a leak between the heatsink and heater block.
@Adam_Steinmark not reallymissing/deleted image from Google+
Then you must be mistaken about the flow during that layer. The filament has to be going somewhere if it’s flowing.
BTW I love your fan setup
it could be z layer, but the little sparse connections make it look like the hotend is sputtering that layer not just printing too high for a single layer while something on the Z screw is upsetting its horizontal plane, check the height of object with calipers and look for a compressed layer squished out those will tell you if the hotend is not at the correct Z.
Have you tried lowering the retraction length… I had same problem the other day getting frustrated with missing layers then realised I had changed it to 4.5mm trying to improve my prints… obviously did not… changed it back to 2mm… now working ok…