Last night I upped the temp to 245dgC and it did get to the first layer of infill before jamming, the previous 3 attempts didn't get past layer 3 so still on the bottom layers. What speed would you recommend for ABS?
DidierKlein 729
I usually print at 40mm/s
I'm guessing your print with the .4mm core right?
If you have been grinding filament for some reason it's mostly sure that the feeder is quite dirty inside, maybe it should be cleaned. If you are sure the nozzle is not clogged then it could be that.
You can check out this link to open the feeder:
https://support.3dverkstan.se/article/64-disassembly-of-the-ultimaker-2-plus-feeder
You don't need to completely take it off, just be able to clean the knurled wheel
Abs is a difficult material and impact strength is better than ancient formulations of pla but about the same as modern pla. If you need it to be really tough then maybe nylon is better.
Also pva doesn't work with abs I believe.
245c should be fine and set fan speed to 1 to 3% on um3. Build plate to 105 or 110. Cover feont of printer and preferably top also. Not sure what your issue is however.
Probably you are.printing too fast. What are all your speeds? (Inner outer shell infill and support). What are all your line widths? Which nozzle and what is layer height? Oh I see layer is
15. Make sure cura isn't printing with a line width wider than nozzle width. That's easy to do by accident and causes grinding.
Hopefully it's just the fan too high.
DidierKlein 729
@gr5 the default profile for ABS sets the fan to 5% And Ultimaker ABS can be printed with the heated bed at 80°c normally.
kmanstudios 1,120
1. If your filament is grinding, you may also have grindings in your bowden tube enhancing friction.
2. New spool? Old spool? Wonder if the filament is a bit stiffer than new and does not relax enough in the tube.
3. Did you thoroughly clean the nozzle between filaments? Hot and cold Pulls? Mixing filament types in the nozzle is not good.
4. How tight is the coil on the filament? For instance, sometimes as the filament gets towards the end of a spool, it will be very tightly coiled. If spool has been wound for too long, it can remain very stiff and bind very much in the bowden tube. This can be affected by time on warehouse shelf and not in use at your place of operations.
Thanks @DidierKlein yes using the standard 0.4 AA print core that came with the printer. I'll try 40mm/s and see how I get on. I'll also try cleaning out the feeders, but as I said I've tried both extruders and I'd never had an issue with grinding before on either of them.
Thanks @gr5 as @DidierKlein said fan speed is 5%, line width is the default of 0.35mm. Point taken about strength of ABS/PLA and to be honest I'm just really printing these for fun with my son who is a massive Robot Wars fan, so unless he wants to start competing, PLA is probably fine and does seem to be a lot easier to print.
Thanks for all your advice.
@kmanstudios Printer is only 1 month old probably no more that 20 prints total. I did notice some small bits of debris in the Bowden tube on extruder 1 and removed and cleaned it. Spools are new to me (around a month) but I take your point about warehouse time, though they printed fine when I first got them. The spool is still fairly full, but being conscious of the issue I did regularly loosen the spool during printing, enough to reduce friction when unspooling but not enough so it could tangle.
Where I might have gone wrong is using the same nozzle for PLA and ABS, when changing filament I've just been letting it feed through until the new filament is clearly running through the nozzle. Is using the same print core for PLA and ABS generally a bad idea?
Incidentally, after a failed print due to grinding, I can unload the filament fine, cut off the section from the grind onward and load it again and it will extrude fine every time during load, and start to print the first few layers fine.
I'll do some more reading on nozzle cleaning, thanks for the advice.
The feeder may be too tight or too loose for your ABS. You might have particularly soft (or conversely brittle) ABS. I have a 6 year old spool of ABS that prints great. No special storage - just sits in a box.
Switching from PLA to ABS is easy but switching back you might want to print hot (around 240C) for 20 minutes to get all the last bits of ABS out. Or do a "cold pull" which is something you do from the menu that cleans out your cores nicely.
The picture below shows (left) not tight enought and (right) too tight feeder settings. There is a screw in the top of the feeder. Moving the line down makes it tighter.
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DidierKlein 729
Hi and welcome!
Is it failing when it start printing the infill or is it failing on bottom layers?
You might want to check the infill speed (you can display this by clicking on the gear next to the speed settings. I would put it to 50 or 40mm/s, or you can simply reduce your global printing speed (i personnaly like more to change all the speeds)
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