i got a new hot end a week ago as mine was none stop clogging now after i installed the new one today now all my prints are coming out weak and looking like swiss cheese ive used new pla thats completely dry and old pla both give the same result what could it be ?
A picture would be worth a thousand words…
The new hotend had a nozzle already installed?
Perhaps the nozzle or hotend has a flake of metal inside.
Did you mess with the tension roller spring/bolt?
Do a cold pull. Repeat until you see the .4mm nipple on the end of the blob.
- Heat nozzle to print temperature and feed a 10 or 20 mm of filament.
- Turn off heater. Monitor the temperature as it cools
- When the temperature hits 110 °C hold the tension lever back and pull the filament out the top.
Any “junk” will get embedded in the blob and be pulled out the top. There is dedicated cleaning filament which works super well but any filament you have works well enough.
Inspect your nozzle for shipping damage. Is the hole round or is it smashed half closed.
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yeah the hotend came with a nozzle but it was tighter then my other new ones so i swapped it out for a different 0,4 nozzle. i havent touched the tenstion rollerspring/bolt and i havent tried a cold pull.
this is what my prints come out like all i did was a benchy to test it and all prints are like this
Sure looks like under extrusion.
Tighter = smaller diameter hole?
Under extrusion ckecklist:
- Partial nozzle clog.
- Print temp too low.
- Plastic stick in the extruder above the heat break.
- Dirty extruder feed rollers.
- Extruder gears slipping on shaft due to loose grub (set) screws.
- Filament tangled on roll
You mentioned clogging issues with your old hot end which elevates the likelyhood of #3.
Do the cold pull. That is the best way to clear a partial nozzle clog. If there is junk that won’t melt in your nozzle you are unlikely to push it through. If the blob comes out shapped like the inside of the nozzle you are golden.
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Classic under extrusion. I’d do all of cardoc’s numbered suggestions. I’d also add leaving the motors engaged so they aren’t easily back driven and try to pull the filament up and out of the extruder when the nozzle is at printing temperature. This tests the extruder gear engagement. If the filament can be pulled out without the extruder motor turning, the extruder’s toothed feed rollers are not properly gripping the filament, which will cause under extrusion. I don’t have specific experience with the SV07 Plus, but on most extruders this can be a problem if the spring and washer bind on the thumb screw that adjusts the extruder idler roller tension. It’s sometimes possible to adjust spring tension but that doesn’t translate to idler pulley tension. That thumb screw should have threads at the tip but not on the shaft where the spring and washer slide.
I’d first try removing the thumb screw, spring and washer, then retracting the idler pulley arm. Look at the drive roller and idler roller. Disable the power to the stepper motors and manually turn the extruder motor to inspect the entire drive roller. Then spin the idler roller and inspect its teeth as well. Clean as needed. Ground filament in the teeth prevents the extruder from pushing filament, causing under extrusion. Carefully reassemble and test to ensure that the filament is tightly gripped by the extruder feed rollers. With no power to the stepper motor, you should be able to turn the motor by hand to feed filament down into the extruder and when you prevent the extruder motor from turning it should be very difficult to pull filament up and out of the extruder.
After fixing the problem, I’d confirm proper extruder function by putting a piece of masking tape on the filament, 100 mm above the top of the extruder, and then extrude 100 mm of filament. The tape should touch the top of the extruder after extrusion, +/- a few mm. Don’t place the tape around the filament so there is a chance of it being pulled down into the extruder. That could be a real mess.
You can also just use a ruler and sharpie, mark 150mm from the extruder, then check that its 50mm after.. lets you know exactly how much it was even if it feeds like 110mm unlike tape, and has zero risk.
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All of my filament is black.
I’m Batman.
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thank u it turned out the pulley arm bit had losen its self to much over time meaning it wasnt gripping my filament propperly
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