Core One + Continuous issues
Hello,
This may come across a little petulant. I am so fed up with the Core One +. I currently have a Prusa XL and in the past a MK4. Both for multiple years, they are great. Complete work horses which you can trust them not to fail.
I finished building the CO+ a few months ago, within the first week i had heat creep. First time experiencing it. Since this, i have had it once more. Also once where filament has broken off in to the "feeder wheel". But today, once again i am getting a horrible clicking, which i have yet to diagnose/fix.
More than this, i love printing in "Hilbert Curve" top and bottom fill pattern. 99% of the time with every filament type the first layer always fails. I find with any other pattern its 50% fail rate on first layer, its mainly happening when the nozzle first makes contact with the bed to print. In the last three or so weeks, once i feel happy the first layer is down, it fails half way through with placing a incorrect layer, then just prints in the air. I have made the mistake of taking no photos. Ill print more this weekend and take them.
I built the CO+ my self, does anyone else have experience like this? I was expecting a work horse like the other Prusa printers, but finding my self not trusting + having to find time to fix/unblock it. I print mainly in PLA with many different brands. I have played with bed/nozzle heat and cooling. But nothing seems to change.
Any direction or advice, i am not sure where to go with trying to make this better.
Thanks in advance, Tristan
RE: Core One + Continuous issues
Also one more point! in the past i have read to leave the door open when printing in PLA, but i am incredulous to think that's a fix. If it is, that would be a design flaw with the printer.
RE:
I built the C1 from a kit (upgraded from a MK4) and haven't had any issue with it beyond an earlier grounding issue with the motors. Since then, I haven't had a problem using it that wasn't caused by user error. I don't print a lot of PLA but I have done 7 or 8 13 hr prints with matte PLA anda 0.25mm nozzle. I've only had to ensure the top vent was open.
Heat creep with PLA on any enclosed CoreXY printer is a common issue and is not specific to a Core One. I also own a H2D and it also has heat creep issues with PLA. Generally if you lower the nozzle temp 5-10C that is often enough to prevent partial clogs. As for filament breaking, well that can happen with old PLA or filament that has been over dried. It's a fact of life. You'll find that on most printers that have a long Bowden tube feeding into a direct drive.
Hilbert curve for infill is an interesting choice. May I ask why? It rather uncommon for PLA/PETG and mostly used in functional prints with engineering plastics. My go to is generally gyroid for functional and grid for everything else.
RE:
Well, you know the Nextruder from your MK4 and the (rather similar) XL print heads, and have experienced its solid performance in these printers. So you know that it's probably not a design issue.
Have you confirmed that the issue you are dealing with is in fact heat creep? You can add the heatbreak temperature to the bottom line in the display to keep an eye on it. I take it that the hotend fan is connected and spinning as it should? Regarding possible other reasons, are you sure you have assembled the Nextruder properly -- planetary gears aligned with the alignment tool, thin washer in the right place?
Unless you operate the Core One in a hot environment, it should not be required to open the door for PLA or PETG prints. Opening the top vent should be all that's needed. That vent grille is open and both chamber cooling fans in the back are spinning, right?
Edit: Oh, and the tension of the spring-loaded idler door is also worth checking!
RE: Core One + Continuous issues
I do have a Core one (kit version) and have perfect prints in both PLA and PETG. Door is always closed, Vent of course open. And I guess many more people have a similar experience. So there must something being wrongly installed or configured...seems there is something wrong with the filament feed - happened to me once with a spool of filament which became tangled - my fault. That gave also nice spaghetti...
Klaus
RE: Core One + Continuous issues
I'm like @kgapp - Core One built from kit and I always have the door closed. Mainly print only PLA or PETG. No issues at all. I do use the GCode to auto open and close the top vent however, noted here: https://forum.prusa3d.com/forum/prusa-core-one-general-discussion-announcements-and-releases/core-one-auto-vent-opening/
RE: Core One + Continuous issues
I sometimes feel a bit guilty because my Core One has so few issues, mostly operator error. I've built precision electromechanical devices my entire career, over 50 years, so I may have done or checked things during assembly that most wouldn't. Checking and removing burrs on parts and tubing, noting how well things were aligned and how smoothly they moved. Subtle binding that most wouldn't notice. I tend to do this stuff automatically so couldn't even make a list. I sometimes wonder if certain recurring problems people have could be the result of tolerances. Prusa's tolerances are generally good to excellent, but excessive variation in critical areas could show up as significant performance differences.
My room is cool by most standards, and I've never had heat creep. I always print with the door closed and I have the filtration system installed, which cuts down air flow. Armchair thoughts- The heat break area of the nozzle is the dividing point. I can't imagine a problem with heat transfer from the heated aluminum block to the nozzle, though I could make a case for a very small amount of nickel-based anti-seize on the threads. The contact of the upper section to whatever the fan cooled heat sink is called, is another matter. Small tolerances on the fit between the upper section of the nozzle, and that, would make a big difference in cooling. Knowing the temperature of the aluminum isn't the same as knowing the temperature of the upper section of nozzle. I could make a case for a bit of thermal grease/paste there. Insertion matters and I don't know if people always get this right. I've attached the photo from the assembly instructions.
I use the Prusa satin build plate. I like it a lot, but adhesion of larger PETG parts isn't great. Small (<50 mm) parts are no problem, but things that take up much of the plate invariably lift at one corner.
Since I got the printer last year (Black Friday sale) I've spent entirely too much time learning the subtleties of 3D printing. In spite of that I feel like I know 2% of what I should know.
RE:
Hello,
This may come across a little petulant. I am so fed up with the Core One +. I currently have a Prusa XL and in the past a MK4. Both for multiple years, they are great. Complete work horses which you can trust them not to fail.
I finished building the CO+ a few months ago, within the first week i had heat creep. First time experiencing it. Since this, i have had it once more. Also once where filament has broken off in to the "feeder wheel". But today, once again i am getting a horrible clicking, which i have yet to diagnose/fix.
More than this, i love printing in "Hilbert Curve" top and bottom fill pattern. 99% of the time with every filament type the first layer always fails. I find with any other pattern its 50% fail rate on first layer, its mainly happening when the nozzle first makes contact with the bed to print. In the last three or so weeks, once i feel happy the first layer is down, it fails half way through with placing a incorrect layer, then just prints in the air. I have made the mistake of taking no photos. Ill print more this weekend and take them.
I built the CO+ my self, does anyone else have experience like this? I was expecting a work horse like the other Prusa printers, but finding my self not trusting + having to find time to fix/unblock it. I print mainly in PLA with many different brands. I have played with bed/nozzle heat and cooling. But nothing seems to change.
Any direction or advice, i am not sure where to go with trying to make this better.
Thanks in advance, Tristan
I also had first layer adhesion issues, with a factory assembled first batch core one. The solution was leveling the print bed using dust cover/spacers and aligning the z screws.
On prusaslicer make a full plate 0.2mm high rectangle and print it. If it doesn't look perfect, you likely have this issue.
Print these and follow instructions
https://www.printables.com/model/1485727-z-axis-gaugetool-for-bed-leveling-on-core-one
https://www.printables.com/model/1289015-prusa-core-one-bedlevel-correction-dust-cover
Basically you turn off steppers and move the print head around close to each Z screw until the printhead snags on the bed. That's your zero. Then at the 2 other z screws you use the gauge tool to check the clearance. For me at 2 of the 3 z screws the bed was 0.8 and 1.2 mm out of level, which is too much for the automated bed leveling to compensate. Then, you print the correct spacers and install them.
Then print these.
2x https://www.printables.com/model/1272101-core-one-front-leadscrew-alignment-helper
1x https://www.printables.com/model/1361308-core-one-back-leadscrew-alignment-tool-helper
Once that is all done you want to put in the correct bed level correction dust covers, then bring the bed all the way down, loosen the screws on trapeizodal nuts, insert the leadscrew alignement jigs, hit Z alignment calibration again, retighten the screws on the trapezoidal nuts.
Then print a full plate 0.2mm square. It should be noticeably better.
RE: Core One + Continuous issues
I have a recently assembled C1+ and not had any such issues except when I accidentally printed PLA with a PETG profile (100% user error).
RE: Core One + Continuous issues
Not had one issue with my Core One's so I suspect an assembly issue. Go back through the instructions to see where you went wrong. It's easy to skip an important point.
RE: Core One + Continuous issues
I have almost constant crashes/restarts. Had one today while changing the nozzle.