Failure at a specific Z level

Lasivian · Post by **Lasivian** » Sun Mar 09, 2014 6:29 pm

so, making vases, and they come out perfectly, until it gets about 3" high, and then it starts not leaving a good line of plastic. It's happened three times now in the exact same place.

http://www.lasivian.com/coppermine/disp ... p?pid=3839
[img]http://www.lasivian.com/coppermine/albu ... G_0035.JPG[/img]

Any suggestions?

sandy · Post by **sandy** » Tue Mar 11, 2014 6:35 pm

question? Is there a temperature difference? Like air currents? I had a problem with cubes delaminating in the middle when I tried putting a small personal fan (not the 25 or 30mm one, but a small people fan). If I put the fan too close (or on medium) the next few layers wouldn't stick.

Lasivian · Post by **Lasivian** » Wed Mar 12, 2014 12:52 pm

No temp differences that I can find. No fans in the room, no heating ducts even. I cannot find any outside influence for it.

Thanks

Post by **Eaglezsoar** » Wed Mar 12, 2014 1:01 pm

Have you tried a different slicer such as Cura or Kisslicer to slice one of your vases to see if it makes a difference?

Holy1 · Post by **Holy1** » Wed Mar 12, 2014 1:18 pm

Have you ran the gcode through an online gcode viewer to see if the problem lies there? http://jherrm.github.io/gcode-viewer/

Lasivian · Post by **Lasivian** » Wed Mar 12, 2014 2:05 pm

Eaglezsoar wrote:Have you tried a different slicer such as Cura or Kisslicer to slice one of your vases to see if it makes a difference?

Damn, never thought of that. Duh.

Thanks

Post by **geneb** » Wed Mar 12, 2014 5:21 pm

Sometimes the obvious solutions (or at least suggestions) are the hardest things to spot. Good luck!

g.

derwoodvw · Post by **derwoodvw** » Wed Mar 12, 2014 7:22 pm

I was reading another post about a similar problem. It ended up being the feed wheel on the feeder motor. The set screw was loose and it always started screwing up at a certain height. Could be a feed problem of some kind.

Captain Starfish · Post by **Captain Starfish** » Wed Mar 12, 2014 8:06 pm

Or that this is the point where the driver overheats and starts skipping - are there any new noises coming out of the printer when this starts to happen?

Lasivian · Post by **Lasivian** » Wed Dec 10, 2014 6:25 pm

Resurrecting my old post because the problem is still happening.

SeeMeCNC PLA, printing at 210c and the extruder skips (click, click, click noise of the extruder gear skipping I think) about 15 minutes into the print. I reduced the hotend temp to 195 and it happened 7 minutes in.

Everything seems fine in the temps and functionality up till, and during it's failure. (IE. I can;t find anything to explain this activity) and the extruder motor is not too hot to touch.

I stop the print, rehome and manually extrude through repetier and it always works.

suggestions?

Thanks

bot · Post by **bot** » Wed Dec 10, 2014 6:52 pm

Could be bowden tube orientation.

Also, doesn't look like it, but this can happen when too many retracts are performed on one piece of filament, too.

Post by **geneb** » Thu Dec 11, 2014 10:13 am

A vase won't have any retracts at all.

Do you have a v1 machine?

g.

bot · Post by **bot** » Thu Dec 11, 2014 4:43 pm

A vase shouldn't have any retracts, but I've had cura pull some excellent pranks when slicing vases. Like putting infill in the perimeter with a million retracts...
But likely not the case here.

Lasivian · Post by **Lasivian** » Sat Dec 13, 2014 2:36 pm

geneb wrote:A vase won't have any retracts at all.

Do you have a v1 machine?

g.

Not sure. I think it's a V1, only one sheet of wood on the top.

When it fails it doesn't matter what the print is, or how I slice it. (IE, the picture is a vase but it's done it on "normal" prints too) If anything it seems to matter how much filament is extruded.

I'm starting to think it's something odd with the temp. I do the "push through filament by hand to find the base temp" test and it starts extruding at 195. However it always fails prints at some point at 195 by the extruder clicking (As if the hot end is clogged and it's grinding filament), but if I ramp up the heat (right now i'm at 220) the print happens later in the printing time. At 220 it's printing without that failure for now. But i'm not printing anything "big". (IE, no more than an hour print time)

220 just seems REALLY hot for PLA to me. But the prints are coming out fine.

Earthbound · Post by **Earthbound** » Sat Dec 13, 2014 4:45 pm

220 for PLA is above the usual norm, but will depend on the exact recipe of the filament you're using. I have a spool (Filamex sea green) that I use at 210-225 depending on the object. Nicer layers above 220, but strings badly. Almost no stringing at 215. You may need more layer cooling at higher extruder temp.

Post by **geneb** » Sat Dec 13, 2014 4:45 pm

The RAMBo cooling in v1 machines is pretty poor. Open the electronics bay door and aim a desk fan at it set on low. See if the extruder stops skipping.

g.

Lasivian · Post by **Lasivian** » Sat Dec 20, 2014 3:14 pm

The more I look at things and ask question in #reprap on Freenode.net the more I think it's related to the extruder.

http://seemecnc.com/collections/parts-a ... ld-end-kit

Partly because, well, nothing else makes sense.

Has anyone Else had issues with this extruder in a similar way?

Thanks

Lasivian · Post by **Lasivian** » Sat Dec 20, 2014 6:59 pm

Hrrm, after pulling things apart I found this inside the bowden tube.

[img]http://www.lasivian.com/coppermine/albu ... G_0421.JPG[/img]

I run a fine file over all the extruder parts, figuring something must be catching inside the extruder body. I reassembled and tried to re-insert filament, which I found caught on the brass fitting under the Extruder. I pulled that off and reamed it out a little and it didn't catch.

So far so good, we'll see what happens.

Post by **Eaglezsoar** » Sun Dec 21, 2014 7:32 am

Best of luck, great troubleshooting to find that!

RAMTechRob · Post by **RAMTechRob** » Sun Dec 21, 2014 12:17 pm

This is a good read. I am having the same problem lately on mine. Printing fine and about 20-40 minutes in, it gets jammed and the extruder knurled wheel grinds away the filament. Maybe I have a bowden tube problem as well.

Lasivian · Post by **Lasivian** » Mon Dec 22, 2014 2:12 pm

This is not happening as often after I cleaned everything up, but it does happen sometimes. Mainly now when it heats up. Perhaps i'm not giving it enough to to totally come up to temp? Not sure., hand-extruding works fine just before I run a print and yet it jams.

Back to the drawing board.

Lasivian · Post by **Lasivian** » Mon Dec 22, 2014 2:57 pm

Well, this has to be something in the hot end. When it started grinding in the extruder again I disconnected the bowden tube from the hot end while it was running and it extruded perfectly. So the jam must be past the bowden connection to the hot end.

What I don't get is why it would be happening 20 minutes into the print with repeated regularity?

teoman · Post by **teoman** » Sun Nov 22, 2015 2:00 pm

I have started to get this error as well.

I either have the filament ground up or it is just turning on the filament without traction. I did clean everyting recently (to solve this issue). I dismantled the hotend and cleaned the extruder screw with an electric toothbrush (very convenient), and aligned it perfectly with the tiny ballbearing. I also replaced the nozzle with a 0.7mm one from seemecnc. But i still find the extrusion stopping half way.

Last time this was happening i started lubing the filament with olive oil. And it helped for a while but then the problems reappeared.

Could it be that the little piece of PTFE tube inside the PEEK has worn out or swollen? How would i go about replacing that?

Thanks in advance,

Post by **Eaglezsoar** » Sun Nov 22, 2015 4:46 pm

teoman wrote:I have started to get this error as well.

I either have the filament ground up or it is just turning on the filament without traction. I did clean everyting recently (to solve this issue). I dismantled the hotend and cleaned the extruder screw with an electric toothbrush (very convenient), and aligned it perfectly with the tiny ballbearing. I also replaced the nozzle with a 0.7mm one from seemecnc. But i still find the extrusion stopping half way.

Last time this was happening i started lubing the filament with olive oil. And it helped for a while but then the problems reappeared.

Could it be that the little piece of PTFE tube inside the PEEK has worn out or swollen? How would i go about replacing that?

Thanks in advance,

See this link: http://forum.seemecnc.com/viewtopic.php?f=54&t=2254

BuckeyeVolunteer · Post by **BuckeyeVolunteer** » Tue Nov 24, 2015 3:50 pm

have you checked your belts? for a wear spot or snag.

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