Any suggestions how to clean a nozzle?
Also is it normal that ABS won’t extrude with 240°C ?
It seems like your Nozzle is jammed.
Get a set of these small drill bits. ( https://www.amazon.com/gp/product/B01ESX40QY/ref=as_li_ss_tl?ie=UTF8&psc=1&linkCode=ll1&tag=tcz-20&linkId=33d759686bd2dbfe37b8fe4ef8beff7a)
Heat your hotend to ~240 and use the drill bits to clean out the nozzle.
Wouldn’t do it a needle also?
I have not tried a needle but if you can find one thin enough - it may work. I personally like the drill bits.
I highly recommend against inserting things into your nozzle unless there’s something wedged in there that won’t come out with a nylon (or other filament) cold pull.
Nylon is your best bet, though.
This is the method: http://bukobot.com/nozzle-cleaning
First give heat supply to nozzle while at normal working condition for few seconds while its getting hot and remove the nozzle with the help of nose-cutting plier. After you have available air with certain pressure or any like that type apply into the nozzle…I think, it will works
I had a blocked nozzle and had someone recommend taking a blowtorch to it, I did that and then put it in an acetone bath. Worked great.
Ohhhh…nice great work
@james_wolf that’s what I’ve done as well. I’m against drilling as it can scratch the metal and cause subsequent jams. But when heating don’t clamp it overly tight. Got my nozzel hot enough to soften the metal and deform it.
Burning out stuck filament will only produce more carbonized filament which will provide more material to clog the nozzle. If it’s so blocked that that’s the last ditch solution buy a new one, hitting it with fire is fun, but I wouldn’t expect it to fix the problem long term.
The post-blowtorch acetone soak will only help things if the material forming the clog is ABS, and won’t do much of anything about the burnt bits you’ve just created.
Blow torch is my go to solution as well.
I print Design Shop ABS at 255°C and it calls for 230°C but I have never gotten it to extrude at that temp. I think this is due to many different factors as there are a lot of varying Temps that people use. Just find what works for you, by starting with what the manufacturer says and then adjust to what really works.
Cleaning, a nylon pull as mentioned above works, but can take a lot of time… I know this is not the “Approved” method but I use a large paper clip and use it to push the plastic and blockage out the nozzle from the top down, once I have removed the Bowden tube and filament. I have had good results with this and haven’t seen any negative effects, such as more blocks due to plastic sticking to scratches in the heat break, but I haven’t tried PLA out yet. I have used this method for over a year btw.
If you have a PTFE liner, printing at 240C might cause damage to that liner and make things worse.
Never stick a drill bit in your nozzle. Drills that small break really easily. If you need to stick something up there (and you usually don’t), acupuncture needles work really well (just buy a size that’s .05mm smaller than your nozzle), or a wire brush bristle can work. The article @Stephen_Baird linked has the instructions.