My SV07 Plus has been a work house lately, but it suddenly started to print unexpectedlt. The only change I made was changing the filament and it printed (basically) rice paper (you can actually see a piece I still can’t get off my plate in the photo). I tried some different files to see if it was just the one plate causing it, but was getting similar results.
So, I went back to the original filament and file I was printed a few times before this started happening and got some pretty crappy prints.
It looks like the filament may be under extruded - but I have been using the settings on a number of prints - the same prints - before.
Any thoughts on how to fix so I can keep using my SV07 Plus?
Most likely you have a partially clogged nozzle.
If you don’t have any cleaning filament, turn the hotend up to 270* & purge around 500mm of PLA.
It will kinda turn to liquid.
Hopefully this will remove the clog, otherwise just change the nozzle.
I agree, that it seems like an underextrusion problem.
But, 270ºC is too much for PLA, it will basically burn and emit definitelly something very bad to inhale.
I’m not sure if SV07 comes with the metal needle/rod that I got with my SV08, but you can use that one to force push whatever is stuck there, or try doing a cold pull etc.
The user didn’t say what other filaments they used. Even PETG can print between 235*-270*.
Cleaning filament is used at 270*-300*.
We want to burn it out by purging. The needles usually don’t work & there is a good chance it will markup the inside of the nozzle.
If the user doesn’t want to purge it out, the only real choice is to replace the nozzle.
I’ve had good success with “cold pulls” using cleaning filament (or TPU). “Cold” is actually about 90-100 °C. Repeat until you see the .4mm nub on the tip of what comes out.
PLA or PETG can work in a pinch but is much more likely to not pull the nub and leave the clog in the nozzle.
I once had a roll of filament that had several pieces of steel shavings (magnetic) embedded in it. I’m actually surprised it doesn’t happen more when buying whatever filament is cheapest today on Amazon like I do.
Generally, the rice paper print is under extrusion, typically either a partially clogged nozzle or some problem with the extruder drive mechanism. You can check the roller engagement by pulling up on the filament with a few pounds of force. If you can’t pull it out with the extruder stepper motor engaged, or the stepper isn’t engaged and the filament pulls out by back driving the stepper motor, the rollers are gripping the filament and there is another problem such as the filament is out of the feed path (TPU is bad about this). If the filament pulls out easily, the filament could be undersized, the extruder teeth chewed the filament making a thin spot or the pinch roller isn’t properly tensioned against the drive roller. If the latter, sometimes it’s misadjusted, and sometimes the spring tension is correct but the spring mechanism is hung up and not pressing the pinch roller against the drive roller.
But you already know it was a partially clogged nozzle, based on the two thin extrusions. That sounds like a contaminate as opposed to charred filament forming a clog. I’ve had metal filings in filament (usually cheap filament) but it’s also possible that king of clog can form if printing in a dusty environment such as a workshop or garage. Keep unused filament in bags or boxes to prevent dust from settling on it.
A hard contaminate such as a small piece of metal will probably not pass through the nozzle. It might be easiest to replace the nozzle but I’ve had good luck with a cold pull by heating the nozzle to 270 C, pushing in some ABS filament, turning off the hot end heater while pushing down on the filament to keep the nozzle full of filament as it cools, waiting until the nozzle cools to room temperature, then heating the nozzle temperature to 100 C and pulling up on the ABS filament after releasing the extruder drive roller. If it’s a clog that results from burned and coked filament, I can usually heat the nozzle to 300 C (or as high as your printer can heat) and push it out with ABS filament. It’ll smoke a little bit but the elevated temperature is needed to soften baked material that has already decomposed at extended normal printing temperature without extrusion.
