brand new kit nozzle crashed and clogged at day 1
 
Notifications
Clear all

brand new kit nozzle crashed and clogged at day 1  

  RSS
cemile.b
(@cemile-b)
New Member
brand new kit nozzle crashed and clogged at day 1

Hi,

I just finished assembling the printer. Everything went well with calibration and I was able to print the prusa logo and the frog. They look both fine. Then I wanted to print a NIST block (the standardisation of ASTM). I downloaded the stl and converted it to a g code with the help of Cura. As soon as I started the print the nozzle crashed to the bed and scratched a portion of it until I was able to stop it.
Then I downloaded the latest version of Cura again and had the g code to give a second try, but now the nozzle looks clogged.
I am not able to move the filament I tried to heat up to 250 degrees and nothing changed. I also tried to unload and load filament options but it looks stuck.
Do I need to unassemble the whole part? If yes, how ? Are there any videos or descriptions how to do? So afraid to do it. It just worked for 3 hours and died=( Please help. 🙄

Posted : 12/07/2017 11:14 pm
StephanK
(@stephank)
Reputable Member
Re: brand new kit nozzle crashed and clogged at day 1

My guess would be that the nozzle got blocked and the extruder was grinding the filament down, that's why it won't move filament anymore.

- open the extruder door and look at the filament (unscrew the 2 long screws with the springs, then flip the door open)
- look at the spot where the drive gear touches the filament, i bet it's worn down there

If that is the case, i'd cut the filament right around the drive gear (using flush cutters or something like that). Pull the remaining filament out from the top. If it wont go through the hole, cut away the frayed bits of filament as well.

Then go and heat up the nozzle for whatever material you've been printing with previously.

Now there's two ways this can go:

1) you could try and grab what filament is still left in the extruder with small pliers and pull it out. You'd pull it out diagonally through the open door.

2) Or you could try to push the remaining filament inwards into the melt zone.

Either way, use a brush and clean the drive gear, it's probably caked with ground up plastic. Then go read up on the procedure called "Cold pulls" (also known as atomic pulls / atomic method) and try to further clean your hot end that way.

If neither is working, you could unhook the hotend fan, heat up the nozzle to about 250°C, wait a few 3-4 minutes to allow heat to creep up into the colder parts and try again. If this still fails, i fear it is time to disassemble the hot end. Which isn't that hard either.

Before attempting another print, rerun the full XYZ calibration and check you z-live adjust. Is your PINDA sensor screwed down tight or is it moving? That's one nasty scratch it cut into your PEI sheet there, but luckily, it looks to me as if the board itself didn't get hurt. I think it's just the PEI.

You'll probably have to try and print around it and eventually swap the PEI sheet - but wait until the printer is working reliably before doing so. After a few prints, the PEI will settle down a bit, sometimes sanding it down to level it a bit helps as well, just make sure you're not scratching the actual bed (600 grit sandpaper is what i used when in a pinch)

Posted : 14/07/2017 5:36 am
cemile.b
(@cemile-b)
New Member
Topic starter answered:
Re: brand new kit nozzle crashed and clogged at day 1

Hi,
Thank you for your suggestions.
I solved all the problems and it is running fine now.

---I am not sure but I think the g code for the NIST block I have taken was made in Cura and the printer was chosen as Ultimaker. Maybe that caused the problem and made it hit the bed. I still do not know and afraid to use the g codes directly. I download the STL's and make sure that I make the g code by myself in Cura.
---For the other problems I will share what helped at most. I kept saying the nozzle is clogged but actually I think the extruder body was clogged. That is why heating up does not help because you are heating up to nozzle but not the extruder body. I broke the needle when trying to make it go through. So if it does not go through but a cm then the nozzle is fine. I disassembled the extruder and unclogged it and assembled back. It was not scary as I thought at all. I followed the steps they describe here;
http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/extruder-body-is-clogged-what-to-do-next--t4513.html#p33270
Ps: When I disassembled the body I need to use a drill as they suggested.
---One last thing I found very helpful was this;
http://shop.prusa3d.com/forum/prusa-i3-kit-building-calibrating-first-print-main-f6/life-adjust-z-my-way-t2981.html
It explains how to adjust the z live perfect. I could not figure out that by just looking at the surface and understand. Those pictures and numbers helped me understand and it worked out.

Finally, the printer is working fine, I have not replaced the PEI sheet and try to avoid that area while printing.

Posted : 07/09/2017 8:59 pm
Share: