Re: Increased failure rate with all filament
At this point in time I think it would be worth a nozzle cleaning.
Since you have two nozzle you could do the following.
With the current nozzle, put the highest temp filament in and do the atomic cleaning method.
Unload the nozzle and remove it.
Place the nozzle in a jar of filled with acetone for a day.
This was one of the first steps I took to ensure it wasn't a nozzle clog.
The first line it puts down is the same as mine with a narrow part at the beginning and a nice fat bead after that. This I believe is just priming the nozzle and is normal. Like I said mine does this and mine prints fine.
I am no expert by any means but running the V2 calibration mine looked like yours when printing the lines on the print bed and I adjusted the live Z until it started to squish. Ran it several times until I was happy that it was squishing it to the bed and I had good adhesion.
I have had to start each print with the Z axis 100mm from the bed otherwise it affects my Pinda when it probes the bed. If I do this then all is well.
But that's not what mine is doing. What you are describing is what the printer should be doing: narrow to fat line. Mine is no longer printing the narrow line.
The spare part in red or orange that you printed successfully looks like to me that the live Z needs to be lower because although it was successful the bead around the outside doesn't looked squished enough to me.
What you're describing is most likely the photo quality, that part printed perfectly. This was also PETG so it's semi-see through.
Can you now print the batman using prusa PLA.
I will definitely try today and post pics but I suspect it'll look like the PETG.
If you start any print and two consecutive lines are not squished ...Bonded together your z is still too high...Yes it can also be under extrusion ...Although your photos do not show that. The pinda probe seems to have accuracy issues with heat over time. I had trouble with it varying so much I quit using it on another printer. There are a few threads on the forum suggesting the very same. The pinda variance is why one print is ok and one is not. The recommendation seems to be make sure your probe is at least 100mm from bed when heating . This way it probes cold ...Instead of hot. Every probe I have tried suffers from this behavior.
I'm not an expert but I thought if two lines are not bonded together within the outlined first layer, it could be the Z height but also it could be under extrusions since the lines being put down are too narrow. It's almost a double issue there because if it's under extruding, the Z won't be low enough but the cause of that was under extrusion.
Here's the thing, everyone says it's the Z because it's one of the most obvious things to adjust in similar cases like this but I do not believe this is the case. I had adjusted the z very close last night and it did not fix this problem and instead stopped filament from flowing properly altogether. To me this does look like under extrusion because the lines it's placing down are very narrow or "beaded" when I compare it to the several other prints I've done over the past month.
I'd like to rule out the Z and the PINDA entirely so I can put that in my initial post. Do you know how I'd go about turning the PINDA off and manually setup the bed?
Thanks everyone for posting replies - I really appreciate the help.
Re: Increased failure rate with all filament
You would have to alter the firmware accordingly and add a z end stop switch. And then figure out how to alter the print bed to be manually adjusted for level. Might be easier to order and try a different pinda ?
Re: Increased failure rate with all filament
I didn't even think of a z endstop. That's kind of important without the pinda stopping it. I'll start looking for a replacement pinda today.
Re: Increased failure rate with all filament
Can you now print the batman using prusa PLA.
The batman in Prusa PLA came out better than the PETG but there still seems to be some issues. I actually raised the Z slightly here (vs the PETG) because I was getting some dragging/flacking on the mid-left section.
I was also able to print a simple ring again in PLA without any brim. Something I couldn't do earlier this week.
It came out pretty well. There is a line that runs vertically on the ring but I think this might be a z-hop thing. There's a little blobbing at the bottom left and the dimension in that portion of the ring is slightly bigger than the rest.
It is a much cooler day here, which might be helping matters with humidity. I dunno. We'll see how ABS and other brands of PLA print. PETG does not look good, however.
Re: Increased failure rate with all filament
The print that had previously fail, try printing it in the center of the bed w/ the Prusa PLA.
Re: Increased failure rate with all filament
The print that had previously fail, try printing it in the center of the bed w/ the Prusa PLA.
The above ring is one of those prints that failed prior to all this 🙂 I always print in the center with single models. I'll try printing off something a little more complex later today and see how it fares.
Re: Increased failure rate with all filament
The bat looks ok. Might still be a bit low on the nozzle.
Re: Increased failure rate with all filament
Pla print looks to be getting close to where it should be. Not massively different to mine if you remove the scabby bit you highlighted.
Do you have enough tension on the extruder drive assembly.
Can your spool rotate freely. If there is any resistance when it takes filament then could be under extruding or possibly even flexing the X carriage up a tiny amount giving you variable Z values. I noticed this on my machine during the Z hop the spool was bouncing forwards and back and yanking the filament. I know you won't get this on the first layer but there is a little flex on the X carriage without to much force required to make it move.
With reference to the initial line the printer lays during the V2 cal yours is identical to mine. I get about 50mm of nothing few mm's of narrow line and then a big fat bead as per your last image of the V2 cal.
Re: Increased failure rate with all filament
Pla print looks to be getting close to where it should be. Not massively different to mine if you remove the scabby bit you highlighted.
Do you have enough tension on the extruder drive assembly.
Can your spool rotate freely. If there is any resistance when it takes filament then could be under extruding or possibly even flexing the X carriage up a tiny amount giving you variable Z values. I noticed this on my machine during the Z hop the spool was bouncing forwards and back and yanking the filament. I know you won't get this on the first layer but there is a little flex on the X carriage without to much force required to make it move.
With reference to the initial line the printer lays during the V2 cal yours is identical to mine. I get about 50mm of nothing few mm's of narrow line and then a big fat bead as per your last image of the V2 cal.
Yeah the scabby bit was because the Z was too close. You can see the other areas where I was getting the adjustment correct.
I believe it has enough tension. The filament pulls through fine and the spool rotates more freely then it did with the awful included hangers from Prusa haha. The first thing I printed were the two filament hangers you can see in my first post. Those hangers hold a light metal hanger dowel, which the filament spins freely on.
Re: Increased failure rate with all filament
Hi!
Definitely no expert - but did you check the hobbed gear thats pulling through the filamnet?
Maybe its clogged up/loose on the stepper/worn out/corroded/...
Re: Increased failure rate with all filament
Hi!
Definitely no expert - but did you check the hobbed gear thats pulling through the filamnet?
Maybe its clogged up/loose on the stepper/worn out/corroded/...
Hi Stephan. I did check to make sure filament was feeding properly and not caught up in the gear. Right now, PLA is working mostly ok. it's still lifting on smaller lines of filament like on the included Vase from Prusa.
Re: Increased failure rate with all filament
To be honest I also had some weird issue with print not sticking to the bed lately. So today, as told by Prusa on this page, I used a scratchy kitchen sponge and used it on the PEI and then used some acetone and It is better. I'm printing holders for my IGUS bushing because I don't like those zip ties, the bed has some slack which I believe can affect quality.
Edit: Just finished the print after using the kitchen sponge and it was way better, even had some difficulties to separate the part from the bed.
Re: Increased failure rate with all filament
To be honest I also had some weird issue with print not sticking to the bed lately. So today, as told by Prusa on this page, I used a scratchy kitchen sponge and used it on the PEI and then used some acetone and It is better. I'm printing holders for my IGUS bushing because I don't like those zip ties, the bed has some slack which I believe can affect quality.
Edit: Just finished the print after using the kitchen sponge and it was way better, even had some difficulties to separate the part from the bed.
Ah that's a great idea and makes sense. I'm definitely going to give this a shot this weekend.