H2D Nozzle Cleaning Filament

I own other dual nozzle printers and have learned that using cleaning filament is essential. Its broad temperature range helps protect the nozzle from damage when mixing different filament types, including TPU.

When loading new filament with the AMS, some old filament remains in the nozzle until the printer purges it at the beginning of the next print. If your last filament was PLA in the right nozzle and you’re now printing with a 320°C filament in the left nozzle, the right nozzle might not react well next time you go to use it.

To simplify the process, I first use the AMS to load cleaning filament, then manually set the nozzle temperature and purge it until all traces of the previous filament are cleared. For convenience, I keep the cleaning filament on a dedicated spool.

@SupportAssistant

I hope Bambu Lab adds a cleaning filament purge option to the touchpad in the future. :crossed_fingers:

Perhaps they’ll bring back the cleaning filament roll as well back then, we didn’t have filament loaders like we do now.

Take care of your nozzle - they can be expensive to replace.

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I highly doubt if a cleaning filament is really necessary. It is only needed for printers that cannot remember the last filament in nozzle. Or if you’re replacing a nozzle with PPS/PPA inside.

If your last filament was PLA in the right nozzle and you’re now printing with a 320°C filament in the left nozzle, the right nozzle might not react well next time you go to use it.

Are you sure this is the behavior? AFAIK the H2D remembers the last loaded filament for each nozzle. The problem should only happen with switching from higher temp to lower temp materials.

Where do we buy this cleaning filament and what kind of stuff is in it?

This is what I use for all my cold pulls. https://a.co/d/1qhgdxV

If I use same type of filament often, it’s not a problem. However, human mistakes are unavoidable, and that’s when you might find yourself dealing with a jammed $20 or $50 nozzle, or shredded TPU inside the extruder, and unexpected downtime.

Whether it happens depends on the level of risk you’re willing to take. Personally, I don’t like dealing with nozzle replacements or losing print time, so I play it safe.

If you don’t have cleaning filament, try testing with some clear filament you might be surprised by how much old residue remains in the H2D nozzle.

I’ve experimented with a few brands over the years, but lately, I’ve just been ordering eSun from Amazon and adding it to a filament spool.

eSUN 1.75mm, Cleaning Filament, Prevent Nozzles and Extruders Clogging, 100g Spool 3D Printing Filament for 3D Printers, Natural

I heard it’s made from a blend of nylon and some secret ingredients to get the
wide Cleaning Temperature Range 160°C - 300°C

Cheapest way to get some cleaning/flushing filament is to buy some “Ziro” brand filament, they all come with a bag of 5M cleaning filament. Ziro is pretty good filament and has some colors no one else has like translucent fluorescent PLA etc.

Screenshot 2025-06-02 at 11.58.07 PM

Also as other have mentioned H2D remembers the last filament used and adjust the flushing temp. After I learned it does that I only use the cleaning fialment before I print TPU from external spool. Just pop out the PTFE tube from hot end and manually extrude a strand.

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I don’t understand why it would happen, unless you’re printing with a swapped nozzle

Yes I also switch nozzle sizes. Maybe I’m a bit old fashioned but I learned my lesson back in 2018 using dual nozzles on Raise3d printers. It’s just now part of my 3d printer routine.

Just be careful - I also use cleaning filament to purge any leftover material whenever I remove and store the nozzles.

Yes I would do that before i swap nozzles, I learnt it previously with some weird ASA-CF that prints at 285C…

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Or you can just dedicate a hotend for TPU only, that’s how I do it.

Thats not ideal as it would require you to rerun high-precision nozzle offset calibration each time you swap hot ends for best print accuracy. I print a lot of TPU and that would be very tedious, flushing the hot end its much faster a few minutes. If you dont do the high-precision calibration than it does not matter.

Is that really necessary though? I’ve swapped hotends multiple times now and never did that calibration again. I can not see any issues when using both nozzles in the same print.

Depends on what you printing and if the best multi material accuracy matter or not. I did buy the vision encoder as well. :man_shrugging:

I guess yeah. I also have the Vision Encoder plate. If I do start to see issues, I know where to look :slight_smile:

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They’ve just added some new multi filament settings this should be helpful. :grimacing:

Bambu Studio V 2.1.0.59

That’s all a waste of time.
I’ve been printing for 10 years and never needed to use a cleaning filament!
How are you assuming the nozzle is damaged?
It certainly isn’t damaged from using different types of filament such as TPU.
The printer purges plenty of filament when starting a print to eliminate the vast majority of problems including switching materials!
Bambu Does NOT need a filament purge or cleaning option.

Total waste of money to be purchasing cleaning filament or wasting time using them.

Have you ever tried starting a PLA print after previously printing with PPA-CF? It doesn’t work out too well. PPA-CF will not completely purge out at 250°c and heating pla up to 300°c+ is kind of idiotic.

Cleaning filament can handle the entire temp range and the machine makes cold pulls effortless. This isn’t about whether it can be done a different way, this is about convenience.

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It’s not about assuming the nozzle is damaged it’s more about maintaining optimal performance, especially when you’re switching between materials like TPU and others. While purging at the start of a print can help, over time, the buildup of residues can still affect the print quality, with different filament types.

Bambu might not “require” a cleaning filament yet, but it’s a helpful tool for ensuring consistent results, especially for users who switch filaments often or want to avoid clogs and under extrusion. Some users don’t need it, but others find it useful as an extra layer of precaution for longevity and print quality.

Just sharing another perspective everyone has their own workflow that works for them!