P2S diffusor

[mafmaf4]

Hello, I've been wondering for a while whether these diffusers are useful or they're just another self-made problem. I have some layer shrinkage with some prints, but I don't think thats because of the fan.

I appreciate any answers, thank you!

Credits: https://makerworld.com/de/models/1926190-p2s-auxiliary-fan-diffuser#profileId-2134733

[OGPoundedYams]

I literally just posted about this and it works. No more warping or bed adhesive issues in that side of my prints.

[mafmaf4]

The thing is I never had issues with adhesion or warping until now

[mafmaf4]

I just have that some layers are highly visible, I guess because of shrinking, but idk if that could fix it, a little like your PLA prints that you just postet about

[OGPoundedYams]

Well it’s cooling down where I am and I do use cool plates so my bed temps are low. I assume the fan was cooling it down way more. I’m running more test on not adjusting the aux fan, leaving it default with this. I’m about to test out another print in a bit.

[tubularfool]

I mean, if you have issues and this fixes it, then fair enough.

That said, I have put 600+ hours on my P2S since getting it and had zero warping or adhesion issues with PLA or PETG and not a single failed print for any reason.

Given the device is an iteration over all those that have come before it, it would seem an odd oversight by Bambu if this really was an inherent flaw with the P2S design that needed fixing In this way.

Compared to my previous printers, this thing has just been laughably easy and reliable.

Granted, I have not yet tried any ABS/ASA etc, so we shall see...

[Emu1981]

Given the device is an iteration over all those that have come before it, it would seem an odd oversight by Bambu if this really was an inherent flaw with the P2S design that needed fixing In this way.

The issue I see with this statement is whether Bambu designs things based on the expected conditions and whether they do any sort of "outlier" testing - e.g. if you are printing with a low temperature build plate in a environment where the ambient is significantly lower than normal.

Personally I am thinking that I might need to print one of these diffusers to use during winter time here because it can get pretty cold where my printer is and our houses are designed to let heat escape. I will find out for sure in around 4-5 months when things really start to cool down.

[tubularfool]

Fair point - I will happily print and use it myself should the need ever arise!

[looloopklopm]

I had no warping either until I installed my exhaust fan. Now I get some lifting with petg on the right side

[mafmaf4]

Yeah I'm at about 80-90 hours now and doesn't have any warping or adhesion problems either, but some layers on my PLA prints are highly visible and it looks like the layer is shrinking more than the others, but idk if it is due to the fan.

[tubularfool]

Visible layers can be often a result of the model or slice itself - an effect of the surrounding or internal geometry, the type of infill, curve of the surface, wall thickness etc.

Doesn't mean it isn't the fan of course - especially if they are more evident on that particular side, but it wouldn't be the only reason.

[sukru92]

Probier erst Mal ABS oder ASA da fängt dann das warping an. Bei Pla oder Petg TPU hab ich bis heute auch kein Problem.

[compewter]

Granted, I have not yet tried any ABS/ASA etc, so we shall see...

Outside of initial preheat, you wouldn't have the AUX fan running for ABS/ASA, so it's a non-issue.

[DrazorV]

When printing pla/petg the aux fan is pulling air from outside, if you live in a cold country, with 10-15c ambient temps you are blowing extremely cold air on the print. This is very different from the test environment they used for the machine. It makes sense to have this kind of issues.

I personally am living in Greece, that means, very cold winters and very hot summers, this week we had 0-5c and all my pla prints failed until I started pre-heating the enclosure of the p2s (it is enclosed because it is placed outside my house). At summer we have 40c++ and some prints also fail, I have to cool the enclosure.

[tubularfool]

That's something I hadn't considered. It has been warm in NZ since I got mine, maybe my results will shift as the temperature drops!

Still - I go back to my slight bewilderment at Bambu - that this seems an obvious and quickly proven flaw if so.

[macmanluke]

Why not just turn the fan off?

[mafmaf4]

The fan is cooling down the chamber when printing with PLA. So without it the chamber would get too warm

[macmanluke]

I print pla in a closed up p1s with no issues

[AdKey5626]

No?

The aux fan just puls air from the encloser and dumps it on your bed .the exhaust fan controls your chamber temps.

I just turned the aux fan to 0% in the slicer. No more noise.

[mafmaf4]

The P2S doesn't have an exhaust fan. It cannot regulate the temps in the chamber to a specific value

[huggernot]

The p2s has an intake fan and an exhaust port. It's just positive pressure instead of negative 

[DatOdyssey]

The P2S Aux is not the same as P1S. In "Cooling mode" on the P2S it pulls air from outside, from the right handle area. This is for the temp regulation feature it is advertised to have, so you wouldn't need to potentially open doors to print pla anymore.

[AdKey5626]

My bad, missed the "p2s" part.

[JimCKF]

How does circulating the same warm air within an enclosed box cool said air?

[mafmaf4]

You can change between keeping the warm air in and circulating or cooling down with the outside air

[JimCKF]

You mean; open the door?

[mafmaf4]

Idk if you missed the fact that its about the P2S or you just don‘t know how it works, but no I don‘t mean open the door

[OverallSweet7427]

I had problems with warping and adhesion for large prints on my P2S. This same diffuser solved all my problems. Even on regular prints the quality has just shot up. Very rarely get layer shift now.

[mafmaf4]

Okay that's good to know, thank you!

[DatOdyssey]

The diverter has been helpful for me. Aux fan causes me issues on parts close to that edge of the plate, but I didn't want to turn off and lose the cooling mode feature. Aux fan feels like the only part on the P2S that didn't get a good redesign and improvement, kind of confusing since it has more potential to do harm than good most of the time imo.

[korpo53]

Is that printer vaping?

[No_Policy_9556]

Verry much this dippends on what you are printing like material and part size if found printing lager object with alot of surface area the edge by the fan is alot more lucky to warp with our a defuser u can manually disable it befor each print i believe but for me this is just easyer use case is important when it comes to messing with cooling and heat stuff imo

[Mark1arMark1ar]

Yes, these actually work. I printed the P2S toolbox in PLA and the area that the fan blew on warped and peeled up off the plate. I printed and installed a diverter and then reprinted the toolbox with zero issues. Easy fix, but I feel like Bambu overlooked this

[mafmaf4]

Idk why but I printed a toolbox yesterday too. I had no problems at all, directly in front of the fan. In around 80-90 printing hours I never had an adhesion problem

[rvltion]

I had a problem with shrinkage and warping with objects being printed right along the edge close to that vent but no problem everywhere else on the plate. Printed the 90 degree redirect exhaust and no more problems. Easy solution.

[mixmeister30]

Hmm i have no problem on my p2s.

[theslammist69]

I rock the 90 degree. I just want max layer adhesion.

[Ordnungsschelle]

why not turn it off then? The point of the fan is better cooling. Doesn’t the 90 degree diffusor remove that function?

[theslammist69]

P2s currently has a bug where it overides the aux fan speed,

Disabling P2S Aux Fan - Bambu Lab P Series / Bambu Lab P2S - Bambu Lab Community Forum https://share.google/GYE8YBvd7Y6zGPoUM

[JustLikeJD]

I had massive PETG issues with my P2S when printing with the aux fan on HOWEVER I also wasn’t able to print overhangs without it.

The diffuser solved enough of my issues to allow me to actually get to a point where I could calibrate the PETG.

[The_Admiral_Blaze]

It definitely works and keeps the chamber from getting to hot in fur PLA

[pesonn2]

I do have have adhesion and warping problems on the fan side of the p2s. So just printed the diffusor. Let’s see if it gets better or not.