Hello guys, I just had issues with a print regarding overhangs. When I printed it with the right nozzle the print had dents and scars. And with the left nozzle it was flawless. The left nozzle gets way more cooling of the part cooling fan than the right nozzle, I hope only my printer has this problem and this is not intended.
You know what. I can’t remember if I did this or not. Did you try selecting the right nozzle when you tested with the paper test. I don’t know if they have something to divert the air more to one nozzle or the other when a specific one is active. I’m in a larger print right now so I cant test.
I’ve tried it, yes. But it didn’t change anything. I have linked a video in the post I made there you can also see it. Did you try it yourself already?
yes, if you put a glass of water under the toolhead you would find that the center of wind pressure is actually under the left nozzle. However I would argue that you still get better than normal / X1C level of cooling for right hotend.
Nope. It is what it is. It would probably be fixable if someone would make a air vent that gives Both nozzles the same amount of air. I don’t know maybe 3d scan or reconstruct the original air vent and then change it a bit so the right nozzle gets more air.
You can place the model closer to the AUX fan and turn it up in case there is insufficient cooling. In fact if you auto arrange the plate it will automatically place the model beside the AUX fan on the left side of the plate.
Also you can install a second AUX for even more cooling, I had dual AUX fans on my P1s and X1. I was thinking about doing it on the H2D but I have not had any cooling issues so far.
Chimming in, seems not be a hardware ISSUE but rather a design flaw. Right nozzle is indeed at weaker , noticable even with feeling the breeze with a finger.
I haven’t measured the cooling performance directly, but I get equally good prints from both the left and right nozzles. Sometimes it’s better to just trust the results and stop chasing ghosts
I have see at least 5 occasions of different people wondering why one side looks like garbage, while the other is perfect, and unequal airflow from the two sides is already an issue to be fixed on any single nozzle printer. Now imagine on two. Definitely not a ghost.
I think the ducting needs small redesign to better split the flow from one fan between two outlets. Seems the issue is they used blower fan, which has outlet on one side, but the duct is not optimized for that or is not optimized correctly.
Blower fan have outlet to one side. The duct seem to have one large inlet from the fan. I don’t know if there is any internal guides that would split the airflow.
I know the L/R ducts are not symmetrical but i’m not sure this is to optimize the airflow.
I might design something that will help distribute the airflow more evenly.
And I’ve also heard at least five people claim that Elvis isn’t dead—so definitely not a ghost either.
Let’s keep in mind that many users are new and genuinely believe they need to tram the bed right out of the box, print covers for every moving part, and mod their machines before even plugging them in. Are we absolutely certain there were zero modifications involved in those five cases? And are we 100% sure the poor print quality doesn’t have a more down-to-earth explanation?
As I’ve said before, I see absolutely no difference in quality between the left and right nozzles. So what’s the real cause? Same thing with that thread where PETG supposedly wouldn’t stick to PEI—I used the exact same model, raised the bed temp (I’m on a CFX plate), and got a perfect result. What does that tell us?
We all have the same hardware, so I’d say it comes down to other parameters. Or what’s your professional diagnosis on this mystery?
Have you ever considered this to be a feature rather than a design flow as I’d be very surprised given all the well thought features that have been introduced on that printer that such an obvious difference is not on purpose.
The airflow is meant at cooling the filament being laid down at the tip of the nozzle. If we take the right nozzle, it will see right airflow directly aimed at its tip and some airflow from the left nozzle (almost unobstructed by the left nozzle as it’s recessed higher) but far from the right nozzle. If we take the left nozzle, it will see higher left airflow fully directed to the tip and very low to no airflow from the right nozzle as it is obstructed.
Sum of the high left airflow far from right nozzle and normal airflow to the right is certainly designed to be about the same as high airflow to the left and very low to no airflow from the right nozzle when viewed from the tip of each nozzle.
What could then be considered as a design flaw at face value may actually just be a feature to maintain close to same airflow at the tip of each nozzle.
I don’t get why nobody talks about this or has found out about this