Saturday night with my Sovol Zero and some cheap filament.. or something!

Sovol Zero
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Does anyone know how this might have happened? I mean how does it flow back up into the silicon cover like that? LOL Thought I’d share a interesting evening of fun. :mechanic: :rofl:

Printing in Black PETG, around 40c in the chamber. Nothing fancy, 12mm3/s (HS PETG). The only thing I had done was swap out the worn out original brass nozzle for a replacement. I know I tightened it, even snugged it down after the original replacement to make sure heating and cooling had not loosened it. Printed 15-20 prints after replacing it, no signs of trouble.

Anyway, happened to have ordered a replacement head and swapped it in, off the the printing again..

Cheers,

  • Mike

left_side
left_side1836×3264 305 KB

both sides
both sides3264×1836 146 KB

all of it
all of it3264×1836 153 KB

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Usually this can happen when the nozzle is loose. The filament leaks from the block back up into the sock.

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Hello,

You can try cleaning it using a heat gun, but do so very carefully.

If you do this, be careful not to break the thermistor wire.

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If the model gets stuck to the nozzle, it will cause the filament to back up into the sock also.

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Thanks for the answers. It has to be either the nozzle coming loose after I replaced it, but I’m doubting that due to me just tightening it a few prints prior, I’m thinking the model coming loose, the print had just started. I’m still very new to the 3d printer world and had not seen videos or experiences a backup like that inside of the cover, found it interesting and shared.

A couple of side questions, do you use purple Loctite or anything on the nozzles to keep them locked in, or just check that they are tight periodically?

What type of thermistor paste is the generally recommended for the thermistor and heater?, I’m going to try to save this extruder hotend.

Thanks,
-Mike

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Did you heat the nozzle to 200°C before removing and reinstalling it?

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No No No :grin:

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Thank you @mich0111 :man_facepalming: I wont admit it, but I will say mistakes were made!

Thanks for sharing the video… just updated my replacement steps to “make sure” to pre-heat to 200 before swapping, now off for a visit with the heat gun :mechanic:

Cheers,
-Mike

fried nozzle
fried nozzle3264×1836 169 KB

well_done_nozzle
well_done_nozzle3264×1836 144 KB

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The replacement was also brass? One piece hardened steel nozzles are much more likely to leak and/or loosen. Bi-metal nozzles not only heat better they seal better too.

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@cardoc Yes, the replacement was also brass, I tried steel and had a heck of a time with temps and went back. The replacement was from a “bulk” set that measured exactly the same as the Sovol nozzle, perhaps the quality is not as good, I also missed the pre-heat step before changing the nozzle out.

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Be careful with the heat gun, set it on low & take your time…this way you won’t damage anything.

But…if you just re-install the nozzle & set the temp to 200* you might not need the heat gun.

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That is a really good suggestion, thanks @Lion! The heat gun and I did not get to far just for that very reason of not wanting to damage something.

Cheers,
-Mike