Filament keep stuck every 4-5 minutes
Hey guys, I'm new here and I need your help, please.
I just finished to build my Prusa i3 MK3s two weeks ago.
I managed to print few small models from the SD Card and from the internet and it went very well.
Now I'm trying to print just a little bit bigger models (4 hours printing model) but it look like every 4-5 minutes the filament gets stuck in the extruder. when it happens I hear "clicks" from the gears that is fidding the filament into the PTFE tube (and I see them jumping back while they are trying to push the filament inside the tube).
Every time it happens, I pause the print, unload the filament, trim the edge of it and load it back and resume the printing as it never happened.
This is how the edge of the filament looks like (the edge is at the buttom side)
So far, I've tried:
- Checking that the PTFE tube is all the way inside.
- Checking that all the Fan cable are connected to the right place.
- Using Canola Oil (i'm using PLA, the one that came with the Prusa kit)
- Changing the retraction from 0.8 to 0.4 or 0.6
- Changing the nuzzle temperature (210c, 205c, 215c)
- Doing all the tests before the printing and every one of them finished with success
- Doing a cold pull twice, but it didn't grab anything interesting.
I'm using the original hotend that cam with the kit and my firmware is up to date (3.8.0.2684)
Thank you for helping me!
RE: Filament keep stuck every 4-5 minutes
Are you printing inside an enclosure? If so, don't. The MK3 is not suitable for printing PLA inside an enclosure.
ps: And why on earth are you using canola oil? What for?
RE: Filament keep stuck every 4-5 minutes
I bet he has seen that video on YT claiming canola oil will season the inside of your heatbreak and make it smoother...
Have you checked the alignment of the bondtech gears relatibe to each other and the ptfe tube? Have you checked if the ptfe tube has been squished on the bondtech side?
@tim-m30 do you know - has the filament path ever been fixed on the stock extruder?
RE: Filament keep stuck every 4-5 minutes
Hey! thanks for your answers.
1. Nope. I don't printing inside an enclosure. the printer sitting on the table as is.
2. One of my friends adviced me to apply Canola oil a when I'm printing PLA (he indeed send me one of thuos youtube video...), it's a prank? 🙂
3. Yup. I Checked it, the gears are in alinment to each other and the ptfe tube.
4. The ptfe tube has been not squished on the bondtech side - I had that before and I replace it.
Thank you very much guys! do you have any more idea?
RE: Filament keep stuck every 4-5 minutes
You could try to loosen the the Bondtech idler. If you tighten it too much you might get loading problems. Take a look on the screw on the left side of the extruder. It should be pretty flush with the housing to start with.
Have you any means to check the nozzle/hotend temperature externally? If the Heatbreak/Hotend/Nozzle package is not assembled correctly you might have temperature issues.
The canola oil is not a prank - it is considered unnecessary and more of a snake-oil thing like those esoteric products that work the better the more expensive they are because auf peoples expectations of them... I've yet to see any convincing proof of benefit by oiling PLA - there are evident disadvantages (adhesion problems).
RE: Filament keep stuck every 4-5 minutes
Have you ever disassembled the hot end?
RE: Filament keep stuck every 4-5 minutes
The filament tips have some 2.2 mm sections; that is indicative of filament melt flowing backwards into the heat break where it cools and increases force needed to push in back into the nozzle where it melts; but your filament also shows signs of melting high in the heat break. That points to an assembly issue with the V6. Lack of heat sink grease and/or heat break not tightened to the heat sink.
I'd start there: take the hot end apart and reassemble it closely following the guide.
RE: Filament keep stuck every 4-5 minutes
Hey! Thank you for all your answers.
I never disassembled my hotend before (it came in one piece), do you still suggest me to take it apart and reassemble it?
RE: Filament keep stuck every 4-5 minutes
[...] 2. One of my friends adviced me to apply Canola oil a when I'm printing PLA (he indeed send me one of thuos youtube video...), it's a prank? :
Filament oiling is not a prank, but its not necessary for the Prusa printers. The E3D "all metal" hotend has a PTFE (teflon) tube at the top that smooths the path of filament entering the hotend. Sone other "all metal" hotends are truly completely metal and a bit of oil helps smooth that entry path. I thought this was an obsolete approach until I watched the Maker's Muse review of the Beeverycreative B2x300 printer. Apparently oiling is still recommended for some hotends. Just not the E3D V6 used on the Prusa.
If you did oil your filament path, there's a chance you've contaminated your PEI print surface. Give it a good cleaning.
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RE: Filament keep stuck every 4-5 minutes
Hey guys, thank you for all of your answers! I don't know what exactly fix the problem (I changed the position of the tube, stop using Canola oil and did some cold pulling [but it didn't extract nothing]), but the situation is right now is that the filament don't stuck anymore.
Thank you very much for all your kindly help!