RE:
This sainsmart 92A seems to grab ok when I pushed through the bowden tube. Ninjaflax and it's softer cousin chinchilla have always been fickle. I can print with ninjaflex and chinchilla on the XL which has a similar bowden tube setup but the fitting is alittle different but it doesn't have that plastic sleeve around it like the coreone does. without that sleeve it's pretty easy to unhook the bowden tube and help the soft filaments in. Over that long a bowden tube it's pretty hard to push 85A and softer filament through and have it push correctly into the extruder. I find for most things I stay with the 92A as my low end and it's perfectly soft enough. the ninjaflex stuff takes some fiddling with and I can't count the number of times I've ended up having it back up into the extruder. I have a few spools of that and of the chinchilla I'm trying to slowly use up.
FWIW, I've done a little Overture 95A TPU w/ no difficulty.
RE: Tension pulley broken
There are a couple other mods which are reported to help with softer TPU. Working my way there, but have also had no issues (once) with Overture TPU at 95a.
So many people mess up the pulleys on the motors. Lots of little details in the instruction manual where if you feel like you've got it figured out you'll just miss. I wish they'd publish a cheat-sheet of those specific things so "advanced" (as in, won't read the directions) users can at least scan and have them in mind.
RE: Tension pulley broken
Just a thought Chris:
Is there a chance that now we're lubricating these tension screws there's a chance they're loosening by themselves as the printer operates?
Might be worth marking them in some way, just to rule this out.Might also be why Prusa have never recommended doing so.
My gut reaction was that this is unlikely, due to the friction between the head of the tension screw and its seat in the bigger block that the pulley mounts to. But the more I think about it the more I agree that it's possible.
I really don't have a feel for whether this is happening or not. Maybe I'll try to mark the bolt heads as you suggested.
RE: Tension pulley broken
Yeah it was just a thought, and an easy one to disprove.
RE:
Here's what support just told me regarding using abs for the tensioners:
"The belt tensioner parts on the CORE One are under mechanical stress, so using a reinforced material like PCCF (polycarbonate with carbon fiber) is highly recommended - this is what we use for the original parts. However, if you're printing spares and can't access PCCF, you can consider: ABS-CF or ABS-GF: these are acceptable alternatives. They won’t be as strong or heat-resistant as PCCF, but for temporary or low-stress use, they should hold up reasonably well. Plain ABS or PETG: we don't recommend - too soft and may deform or crack over time. So yes, you can use ABS-CF or ABS-GF as a backup, but PCCF is still the best option for strength and reliability."
RE: Tension pulley broken
Here's what support just told me regarding using abs for the tensioners:
"The belt tensioner parts on the CORE One are under mechanical stress, so using a reinforced material like PCCF (polycarbonate with carbon fiber) is highly recommended - this is what we use for the original parts. However, if you're printing spares and can't access PCCF, you can consider: ABS-CF or ABS-GF: these are acceptable alternatives. They won’t be as strong or heat-resistant as PCCF, but for temporary or low-stress use, they should hold up reasonably well. Plain ABS or PETG: we don't recommend - too soft and may deform or crack over time. So yes, you can use ABS-CF or ABS-GF as a backup, but PCCF is still the best option for strength and reliability."
Seems like good advice. Personally, I think there's a bit of margin, given that my ABS mounts seem ok so far, but for a long-term fix you can't argue with Prusa's advice. When my ABS mounts eventually fail and ruin a long print job you'll all be the first people I'll tell!
RE: Tension pulley broken
So far so good. I've done PLA, PETG and tpu. I was looking at the mods to make the softer tpu work more easily but I've not tried any of them yet. I'd like to just get some time on this so I can decide if I want to pull the trigger on the other upgrade kit. Other than being a bit more loud than the mk4s inside boxomo enclosure, I tend to like the coreone. Time will tell. Right now I'm looking at venting options. I see there are quite a few options on printables. Sometime back I purchased the printable pipe system design on printables and I like that. I'm going to see if I can get an adapter to that 125mm piping since I've already printed a number of the pieces.
Thanks for everyone's help.
RE: Tension pulley broken
seems like conservative advice I did however got differente advise and got 'whatever matches or goes beyond PC temperature limits' would work, in other words, I was suggested that PA6 would work as well.
It seems that the answer varies depending who you talk to at support.
RE: Tension pulley broken
Yeah I've found that to be the case on other, unrelated issues also. When I first broke my first tensioner I was told any nylon would do. I guess they were just trying to avoid the cost of sending out replacements altogether, by getting end users to print their own replacements.
I'm gonna have to bite the bullet and get some PCCF , I've got plans on modifying a few of the printed parts also.
seems like conservative advice I did however got differente advise and got 'whatever matches or goes beyond PC temperature limits' would work, in other words, I was suggested that PA6 would work as well.
It seems that the answer varies depending who you talk to at support.
RE: Tension pulley broken
That YXPOLYER one I picked up on amazon printed alright and my current Y pulley is printed from it.
It was pretty reasonable
https://www.amazon.com/dp/B0DZ6RBC31?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
Yeah I've found that to be the case on other, unrelated issues also. When I first broke my first tensioner I was told any nylon would do. I guess they were just trying to avoid the cost of sending out replacements altogether, by getting end users to print their own replacements.
I'm gonna have to bite the bullet and get some PCCF , I've got plans on modifying a few of the printed parts also.seems like conservative advice I did however got differente advise and got 'whatever matches or goes beyond PC temperature limits' would work, in other words, I was suggested that PA6 would work as well.
It seems that the answer varies depending who you talk to at support.
RE: Tension pulley broken
That YXPOLYER one I picked up on amazon printed alright and my current Y pulley is printed from it.
It was pretty reasonable
https://www.amazon.com/dp/B0DZ6RBC31?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1Yeah I've found that to be the case on other, unrelated issues also. When I first broke my first tensioner I was told any nylon would do. I guess they were just trying to avoid the cost of sending out replacements altogether, by getting end users to print their own replacements.
I'm gonna have to bite the bullet and get some PCCF , I've got plans on modifying a few of the printed parts also.seems like conservative advice I did however got differente advise and got 'whatever matches or goes beyond PC temperature limits' would work, in other words, I was suggested that PA6 would work as well.
It seems that the answer varies depending who you talk to at support.
It's very reasonable for Americans!
Its double the price to get that filament in the UK.
RE: Tension pulley broken
Yeah, I've not lived in the UK for a number of years, I do remember it being expensive there though. I'm curious if you have better prusa prices given your're geographically closer than I am(Colorado) to Prague.
It's very reasonable for Americans!
Its double the price to get that filament in the UK.
RE:
This seems like a cheapish option in the UK: https://www.amazon.co.uk/IEMAI-Filament-Lightweight-Toughness-Dimensional/dp/B0D53JF28B?th=1
500g for £18, if you only need a little, but they also have 1kg and 2.5kg options.
RE: Tension pulley broken
yeah that's 20% CF too, so I would assume slightly stronger overall
This seems like a cheapish option in the UK: https://www.amazon.co.uk/IEMAI-Filament-Lightweight-Toughness-Dimensional/dp/B0D53JF28B?th=1
500g for £18, if you only need a little, but they also have 1kg and 2.5kg options.
RE: Tension pulley broken
Yeah thats the one I’ve been eyeing up Chris. I just bought a Kilo…fingers crossed it’s not crap 😂
RE: Tension pulley broken
I’ve gone for a 500g roll, to compare to the Prusament, and maybe be a bit less parsimonious with it - wasting the Prusament is painful because it’s a bit like hen’s teeth, as well as being rather pricey.
RE: Tension pulley broken
One thing I noticed for the YXPOLYER stuff when I printed the pulley on the XL, it tends to ooze. When I loaded the filament and it stopped extruding, the filament kept oozing out for several seconds. On the XL this is terrible for things like tool changes. And thus the temps for filament profiles on the XL tend to be lower than on the single extruder models. it's something to keep in mind if you have an XL and you're going to print that stuff on it.
RE: Tension pulley broken
I’ve gone for a 500g roll, to compare to the Prusament, and maybe be a bit less parsimonious with it - wasting the Prusament is painful because it’s a bit like hen’s teeth, as well as being rather pricey.
I’ll be interested to hear your comparison of the 2.
Im a big fan of cheaper filaments, last time I went in blind was for Tinmorry PETG-CF, and I have to say for the price I really like it. About once per month it’s reduced even further on Amazon and I get 2kg for £35. I burn through the stuff, now it’s my goto when I’m prototyping anything. It prints like a dream, looks great and prints are strong AF.
RE: Tension pulley broken
One thing I noticed for the YXPOLYER stuff when I printed the pulley on the XL, it tends to ooze. When I loaded the filament and it stopped extruding, the filament kept oozing out for several seconds. On the XL this is terrible for things like tool changes. And thus the temps for filament profiles on the XL tend to be lower than on the single extruder models. it's something to keep in mind if you have an XL and you're going to print that stuff on it.
You need to dry the filament. PC is very hygroscopic. Oozing is a good sign that it is wet. I use a filament dryer to dry the new spool and then store it in a 5 gallon bucket with desiccant. When ready to print I print directly from the filament dryer as well (mainly so I do not have to re-dry it after the print). The filament does not ooze at all.
RE: Tension pulley broken
Ah good to know. I was in a hurry so I didn't do it. I have a printdry that will do the 70-80C needed. I'll go ahead and do that and seal it up so it's ready the next time I use it.
You need to dry the filament. PC is very hygroscopic. Oozing is a good sign that it is wet. I use a filament dryer to dry the new spool and then store it in a 5 gallon bucket with desiccant. When ready to print I print directly from the filament dryer as well (mainly so I do not have to re-dry it after the print). The filament does not ooze at all.