One thing to remember is that the Sumlu and the Creality and whichever other brand you want to name, are dryers. They are not automatic material handling systems. Yes, you can feed out of them, but you have retrack the filament and swap filaments. They don’t do it. At least my S4 doesn’t.
I do not follow. My Ace units retract and change to other filament rolls, all while heating.
Also, someone claimed that the AMS 2 Pro does support PLA beeing installed (not printing!) when drying on the HD2. So… why does the P1S not support this?
Here’s my report. The group has both the AMS2Pro hooked up to H2D for last couple months. Also because of some of these limitations got the Creality Space Pi X4… it’s okay…
What has changed?
With Initial firmware in ~June (shipped in late May):
- Minimum Drying Temp was 50C… with PLA loaded in inlets (not tube) it would immediately throw error that it’s too hot…
- You could not dry while printing, (STILL TRUE).
- I think there was something about not being able to control the rotation, which would make sense about why you couldn’t have any filament in the inlet.
- I do believe you could never dry with filament “loaded” to nozzle/ in ptfe tube (even during the golden age of the intermediate fw described below???)
Experience, the gentle passive heating that I think is performed if the printer is left on/idle does control humidity slightly, in a temperate climate (with chemtrails on full blast, and unprecedented seasonal temps and humidity during this time last two years), nighttime humidity during a relatively humid period (but not peak season) would be about 65%, dropping down to about 45% peak daytime during this sub-max season. The H2D is hose vented into a cracked window b/c we haven’t found a good set of window plates project, and will have to make our own probably…
It was good, we’re all too new at this to know how much stringing or skips or whatever we might be having because of temps.
RH would climb to about 45% overnight inside the AMS2pro.
After a couple hours of printing it would drop to mid / thirties.
We could run the drying and drop everything 6-8% roughly, and then again, for another 8% this would pretty much last as long as we were printing for about half the day I want to say, mb 4-8 hours? idk… So, it seemed like somehow actually printing would control/reduce the RH inside the AMS2pro… Not only looking at the ams2pro’s report to the h2d, but also some of those cheap circle hygrometers. I dropped one of those in a “Drying Pod” project. so, I’ve got 3 “drying pods” in there too , the one with the hygro with 20g, and the other 2 with 40g each, so that’s 100g of silica that went in late June. Seemed to drop overall RH around another 3-6%.
So, if we had dried recently (with a few days) and were printing we were down to about 23% RH inside by the time the first print finished mid day.
Not bad for newbies.
Then a firmware update came out mid July or something? IDK, check the dates…
- This allowed for 45C drying!!! Yay! no more errors for PLA, lol, smh… wtf? This was great though, b/c I dry at like 47/48… a lot of matte stuff will get gooey, even at those temps for “constant low humidity” type of drying… i.e. leaving it in the creality… or the AMS2Pro for that matter.
- WE COULD DRY WITH THE FILAMENT LOADED INTO THE INLETSSSSS!!! YESSSS!!! Just untick the box for filament rotation!!! (we already picked up the Creality X4 early July, BECAUSE of this limitation so we could have our filaments ready to swap in immediately, and hearing that TPU is a tricky beast, and planned to run the creality from above on a nearby shelf…)
- Still can’t dry while printing.
Then the firmware update in the last week… It was bundled with a FW update for the printer, and I did it on the panel, and had NO release notes for the AMS2pro… if I had known…:
- ABILITY TO DRY with filament in inlets NOW REMOVED!!! NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
- Why? Screen looks the same, it acs like I can dry with rolling filaments unticked, but nope, button still ghosted!
…
If you don’t want filament in PTFE fine, but none of what I’ve described was with filament LOADED in TUBES, only inlets, filament has not been loaded in tubes any of these times…
Okay, I might be misremembering something technical like that… but what I know is, I was allowed to use the AMS2Pro in a logical manner for a newbie for about a month and now I can’t again.
Quick Creality X4 mini review.
You CAN feed into the left nozzle nicely with it on shelf up above with a fairly long run. Ran matte and basic through it (BBL) like that.
You Can of course dry while running filament, b/c the X4 has now idea what’s happening.
There are two AUTO functions.
An auto dehumidify, which is fairly minor and semi passive and has no real controls if I remember, and an AUTO DRY function, which allows the following:
either 30 or 60 minute dry that kicks on once in a while (mb has to rest for 30-60 minutes to go again) with a settable temp (45c is lowest temp for X4 as well), and a target RH down to 20%. So I was just leaving this on at 47C target 20% for 1 hour… but it was like always on, on both sides… and that was a bit too much…
MAIN PROBLEM WITH Creality X4 IMHO… WAYYYYYY more RH creep than the AMS2Pro… like it’s a lot, it doesn’t QUITE reach ambient but it approaches it for sure, but it CANNOT stay down… the exhaust fan slots are just basically poorly designed and allow too much back in I think. even with the Auto dry for an hour every other hour or 30 minutes, or whatever it is… unless you’re cooking your Filament constantly… and this did end up softening a matte PLA adapter for an eSun PLA+ cardboard spool I’d made (199mm Flat, the 200mm adapter scraped the inner top of the AMS2Pro sadface. The adapter probably won’t survive another 40 hours of drying time, it’s pretty loose, just barely stays on…
Oh, also it doesn’t rotate, but at 47C I think hotspots isn’t the issue, I think with auto-dry on you’re slowly going to cook your PLA either way… it’s too much… what this stuff would appear to need, imo,
I would say the design difference in the exhaust/inlets is probably a big part of the RH creep on the X4… oh well… for the TPU we might just get one of the fancy or cheap single dryers that have rotation and much tighter control… Also, just seems easier than messing with the X4 in a cramped shelf hard to read the front panel/load, though doable… it’s just not great for our uses… if you have a huge multiple colored project, and you can’t stop printing to mess with AMS2Pro… I think the X4 would make sense (we did have this recently, so it was nice for that), but typically I would recommend for High End stuff the Polymaker or that other single dryer that comes in black or white… also the Eibos 2 up with ROTATION looks awesome, wish we’d gone with that… yes, the X4 came in handy in one time limited project… but hopefully we don’t have to do something like that again…
I say this BRING BACK DRYING WITH FILAMENT IN INLETS… wtf???
My idea to help out with this is 2-fold.
- Design a window exhaust bracket so not much outside air is coming into the room (when will I have time for this?)
- Get a mini dehumidifier for the room.
I’m sure, that the group is lucky enough that this would basically take care of RH creep on both the AMS2 and mostly the X4, which is less of an issue IF it doesn’t climb so fast, since it’s more flexible.
I say we all demand bambu bring back inlet-compatible drying!!!
The ams2Pro outside of that is FRIGGIN AWESOME… all you want is another one as soon as you have one working well… I think I could be happy with two, lol, but that price tag… I’d rather have an A1/Mini/centauricarbon… idk…
I can dry with filaments in the feeding inlet as long as it is only at 45c. I have the latest firmware on my H2D. If they added and removed that ability that is news to me as I have not been effected by that.
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I bough ams2pro combo with p1s but it never feeds fillament
I have a P1S with AMS2 Pro (2 AMSPros, actually), that they have no trouble feeding filament.
What exactly do you mean by “it never feeds filament”, as I see you’ve posed a few times about this now, but not really given any more detail that this.
For starters:
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Are you using the filament buffer or filament hub to feed into the printer?
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Is the AMS plugged into either the buffer or the hub, and then the buffer or hub plugged into the printer?
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Does the printer detect the AMS unit is connected?
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Does it detect when you insert the filament (as in, it will start to pull some of the filament in, and then start feeding it and then retracting so that it can check for the RFID tag on the reel).
Still waiting on that update for the P1S / AMS 2 Pro. Drying when filament is loaded is possible with PLA support and PETG, but not when PLA is assigned/read from the chip. This is annoying @bambulabadmin Also the AMS 2 Pro is missing this “keep my filament dry” function like “all the other” dreyers use.
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I have a p1s with the original ams and the ams2 pro. and a ams HT. I have zero issues using all 3 at the same time?
Did you reply to me by mistake? As I don’t have any issues with the P1S + AMS2Pro 
The 95 Theses for AMS 2 Pro Dry-While-Print
- Printing should not stop drying.
- Drying should not stop printing.
- Both functions can coexist peacefully.
- Filament is hygroscopic, moisture is relentless.
- Quality degrades mid-print if drying halts.
- External dryers prove the concept.
- Users paid premium—want premium workflow.
- Reloading filaments wastes time.
- Reloading filaments risks tangles.
- Reloading filaments wastes material.
- Reloading filaments wastes patience.
- Humid regions suffer most from this design.
- Firmware fixes are possible, not hardware-blocked.
- Competitors already allow continuous drying.
- The AMS 2 Pro has heating capacity unused.
- Safety disclaimers are enough—let us opt-in.
- Choice is better than prohibition.
- Advanced users should have advanced toggles.
- A “Smart Dry” mode solves both camps.
- Idle slots could dry while print slots feed.
- Heat creep risk is manageable with temp limits.
- Desiccants are stopgaps, not solutions.
- Continuous drying protects unused slots too.
- Long prints (24h+) demand steady drying.
- A humid night can ruin a spool.
- Spools don’t magically stay dry mid-print.
- Preventative drying is easier than rescue baking.
- Bubbles in filament mean wasted hours.
- Stringing can come from moisture alone.
- Nylon especially demands continuous drying.
- PETG can absorb enough to ruin clarity.
- TPU softens but still benefits from gentle heat.
- User-adjustable temps = safe experimentation.
- “Assist Dry” at 35–40 °C would work.
- Full Dry after print completes.
- Dryness is not binary; it’s gradual.
- AMS 2 Pro should embrace gradual management.
- A premium machine deserves premium logic.
- Users buy AMS to reduce fiddling, not add more.
- Drying while printing reduces external hardware.
- Desk space is limited; stop making us buy add-ons.
- Energy usage is minimal for assist mode.
- Fans + slight warmth keep RH low.
- Sensors already exist in the AMS—use them smartly.
- Auto-detect humid spikes during prints.
- Trigger “assist drying” automatically.
- Give us graphs of spool humidity during jobs.
- Transparency builds trust in Bambu hardware.
- Don’t force people into DIY hacks.
- Embrace community request before 3rd-party firmware does.
- Competitive advantage is user delight.
- Preventive drying reduces warranty complaints.
- Fewer clog tickets = happier support teams.
- Long-term reliability = stronger brand loyalty.
- AMS stands for Automatic Material System.
- “Automatic” should mean less babysitting.
- Right now it feels like “Semi-Automatic.”
- No printer should halt drying mid-mission.
- It’s like pausing an oven every time you eat a cookie.
- Or pausing AC just because you opened a door.
- Or pausing raincoats when it rains.
- The logic is upside-down.
- Dry-while-print isn’t dangerous when controlled.
- Disable for PLA+TPU combo if needed.
- But don’t block PETG/Nylon users.
- Granular profiles per material—perfect.
- Community would help test profiles.
- Let beta-firmware prove viability.
- Even a hidden “expert toggle” suffices.
- The risk is overstated compared to real benefits.
- AMS users are already advanced hobbyists.
- We handle slicer tweaks, we can handle dry tweaks.
- A check box in Bambu Studio is all it takes.
- Name it “Experimental Dry Mode.”
- Add a skull icon if you must.
- People will still use it.
- And they will thank you.
- A firmware update is cheaper than a recall.
- A firmware update is cheaper than bad press.
- Forum demand proves unmet need.
- Reddit threads echo the same.
- Third-party solutions show hunger.
- Bambu can own the narrative by responding.
- Silence breeds frustration.
- Updates breed loyalty.
- Community thrives when listened to.
- Dry-while-print is an easy win.
- An optional feature hurts nobody.
- A missing feature disappoints everybody.
- Drying is AMS 2 Pro’s unique advantage—don’t cripple it.
- Drying should work seamlessly with printing.
- Innovation means breaking false limitations.
- Let drying and printing coexist—like yin and yang.
- Empower users, don’t restrain them.
- The door of the 3D printing church now bears these words: Let Us Dry While We Print.
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sorry thought i was replying to the thread and not you .
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Aw… you didn’t make it a neat 100? Nice list though, kudos!
Quick follow up on this discussion:
Has anyone noticed that AMS2 appears to support PLA drying at 45 degrees C without removing the filament, but only in certain cases?
I have access to a pair of H2Ds both with AMS2s, they both have the latest firmware (as do the AMS2s), one of them supports drying PLA at 45 degrees without removing the filament but the other does not (requires you to remove it first).
I’ve also seen this is the case when using the AMS2s with X1Cs and H2Ss, all with current firmware and the power adapters. Of all the printers I’ve tried (8 in total), only one of the H2Ds seems to actually allow this function, and the only thing that’s different is that this printer also has an AMS HT connected on the other print head.
Thoughts?
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So… P2S is out, A1 can now use AMS, but AMS2 still doesn’t allow us to print while keeping the camera drying, and whenever we need to change the roll, the humidity level rises again, in addition to wasting time leaving the printer idle due to the need for drying. Drying slowly is better than not being able to dry at all…
@BambuLab ???
Notice this on FAQ. Print and dry at the same time?
“If you need to dry filament while printing, you’ll need to purchase a Bambu Lab official power adapter to power the AMS 2 Pro.”
Welcome to the forum!
I believe it means if you are printing from one AMS 2 Pro and want to dry from a second one.
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Also states the same thing on the product landing page. Doesn’t say to use two AMS 2 units. I don’t know, I’m new to this, so perhaps it’s implied?
- For X1/P1 owners, If only using the automatic filament feeding function, only the 6-pin bus cable, 4-pin bus cable, Filament Buffer/AMS Hub, PTFE Tube and PTFE Tube Coupler are required, and no external power adapter is needed. If you need to use the drying function, an external power adapter is required for the AMS 2 Pro. Please use the official Bambu Lab power adapter. Product damage from third-party adapters won’t be covered by the warranty. We recommend to purchase the upgrade kit directly with lower price.
Makes sense to me. One power supply isn’t enough to keep both the printer and ams working at the same time.
Ohhh, sorry, yes for the X1/P1 you need the power cord to dry. I don’t know why I thought you were talking about the H2 series. With those you only need it if you’re printing from AMS 2 Pro and you want to dry in another.