Notifications
Clear all

Prusa Filament Dryer excellent addition  

  RSS
Butters
(@butters)
Estimable Member
Prusa Filament Dryer excellent addition

The Prusa USS Drybox I was sold immediately when I saw it; this is what I wanted for the CoreOne. I'm sorta glad that I was extremely slow in assembling my CoreOne. 😀 

Although, can it fit all filaments ? I was going to purchase a filament dryer but I'm glad that this just fits on the side. This dryer is an excellent idea

Posted : 19/11/2025 12:17 am
Jürgen
(@jurgen-7)
Noble Member
RE:

It is not a filament dryer, just a storage box. If a filament has already absorbed humidity, the USS box can't dry it because there is no heater built in.

Anyway, it might be a nice storage solution. But given the cost I would only consider it for a couple of filaments which I am using most often. Everything else will be stored in other ways and will still need to be dried before use. And whether Prusa's claim works out that you can "place the spool inside once and leave it there until you’ve used it up" will depend on how long it takes you to use up the spool. 

Posted : 19/11/2025 7:23 am
hyiger
(@hyiger)
Noble Member
RE: Prusa Filament Dryer excellent addition

 

Posted by: @jurgen-7

And whether Prusa's claim works out that you can "place the spool inside once and leave it there until you’ve used it up" will depend on how long it takes you to use up the spool. 

Nylon filaments, especially PA6 are unprintable after 2 days in a dry box with < 10% relative humidity. I've been using a relatively cheap dry box solution. Can't imagine the Prusa dry boxes are going to be cheap. 

Posted : 19/11/2025 4:46 pm
Butters
(@butters)
Estimable Member
Topic starter answered:
RE: Prusa Filament Dryer excellent addition

How can I purchase filament now and keep it in excellent condition even if I use is sparingly ? I'd have to buy a separate dryer or is there a specific way to store it ?

Posted : 19/11/2025 6:24 pm
Thomas Lynch
(@thomas-lynch)
Estimable Member
RE: Prusa Filament Dryer excellent addition

I keep my filament in these water tight sealed plastic boxes. Each box has 4 or 5 little cotton bags filled with Silica-Gel. It keeps my filament at about 20%RH.When it goes to about 30%RH I just take out the little bags and empty the Silica-Gel onto a paper plate and put it into my microwave for about 2-3 minutes and put it back into the cotton bags and return them to the box they came from. Each box holds about 15 rolls of filament. I have 4 of them all full of filament. When I need a certain filament I just go into one of these boxes and take what I need, use it and return it to the box it came from. It is always dry and ready to go. I have been doing this for quite a few years and have never had a problem with wet filament.

Tom

Posted : 19/11/2025 7:39 pm
cwbullet
(@cwbullet)
Member
RE: Prusa Filament Dryer excellent addition

 

Posted by: @butters

How can I purchase filament now and keep it in excellent condition even if I use is sparingly ? I'd have to buy a separate dryer or is there a specific way to store it ?

I would a Polydryer by Polymaker.  It is the best of both worlds.  It is both a dryer and a storage box.  You can also buy additional storage boxes.  

 

https://us.polymaker.com/products/polydryer?variant=43078512181305

--------------------
Chuck H
3D Printer Review Blog

Posted : 19/11/2025 7:53 pm
Cédric
(@cedric)
Estimable Member
RE: Prusa Filament Dryer excellent addition

 

Posted by: @hyiger

 

Posted by: @jurgen-7

And whether Prusa's claim works out that you can "place the spool inside once and leave it there until you’ve used it up" will depend on how long it takes you to use up the spool. 

Nylon filaments, especially PA6 are unprintable after 2 days in a dry box with < 10% relative humidity. I've been using a relatively cheap dry box solution. Can't imagine the Prusa dry boxes are going to be cheap. 

https://www.prusa3d.com/de/produkt/prusa-uss-drybox/?fbclid=IwY2xjawOJiGlleHRuA2FlbQIxMQBzcnRjBmFwcF9pZA80MDk5NjI2MjMwODU2MDkAAR5sVXgNkbv8FV-1u865nKWB0FUJx2J8_JPI95MPTr4wHSdaucjHnadkr-CzDw_aem_br_PSMn8zVVJtFph1lE35Q

33euro, not bad at all

Posted : 19/11/2025 9:12 pm
Butters
(@butters)
Estimable Member
Topic starter answered:
RE: Prusa Filament Dryer excellent addition

$50 in my currency. The Prusa DryBox is the best solution, at two it's cheaper then the Polymaker link suggested above. With this drybox all moisture is removed from the filament ?

Posted : 19/11/2025 9:20 pm
Jürgen
(@jurgen-7)
Noble Member
RE: Prusa Filament Dryer excellent addition
Posted by: @butters

$50 in my currency. The Prusa DryBox is the best solution, at two it's cheaper then the Polymaker link suggested above. With this drybox all moisture is removed from the filament ?

No. As stated before, the Prusa box does not have a heater, so it cannot dry filament which has already become moist. It can only keep filament dry when it is already dry, for a while. In contrast, the Polymaker solution does contain a heater, which explains its higher price.

The term "drybox" is not used fully consistently. But nearly always it means just a passive, well-sealed box which keeps dry stuff dry, the way the Prusa box does. A device that can make humid filament dry is typically called a "filament dryer".

Posted : 19/11/2025 9:29 pm
2 people liked
hyiger
(@hyiger)
Noble Member
RE: Prusa Filament Dryer excellent addition

 

Posted by: @butters

$50 in my currency. The Prusa DryBox is the best solution, at two it's cheaper then the Polymaker link suggested above. With this drybox all moisture is removed from the filament ?

Put a raw steak in a dry box, then take it out after a week. Is it beef jerky? No, it's still a raw steak (and probably moldy). 

Posted : 19/11/2025 10:00 pm
mnentwig
(@mnentwig)
Reputable Member
RE:
Posted by: @hyiger

 

Posted by: @butters

$50 in my currency. The Prusa DryBox is the best solution, at two it's cheaper then the Polymaker link suggested above. With this drybox all moisture is removed from the filament ?

Put a raw steak in a dry box, then take it out after a week. Is it beef jerky? No, it's still a raw steak (and probably moldy). 

Slice it as thinly as reasonably possible (that's the hard part), marinade in a bottle of Worchestershire sauce, soy sauce, a few spoonfuls of Ketchup, a glass of whiskey and a few ingredients I forgot. Reduce time to about 12h and we're talking business.

Is this getting OT? 🙂

Well almost. Note to self, when next buying a food drier for beef jerky, make sure it fits filament spools :facepalm

Posted : 19/11/2025 10:49 pm
1 people liked
Butters
(@butters)
Estimable Member
Topic starter answered:
RE: Prusa Filament Dryer excellent addition

Steak and whiskey dry out filaments. Rather does someone want a steak and whiskey. 

Posted : 19/11/2025 10:50 pm
mnentwig
(@mnentwig)
Reputable Member
RE: Prusa Filament Dryer excellent addition
Posted by: @butters

Steak and whiskey dry out filaments. Rather does someone want a steak and whiskey. 

And a bottle of Worchestershire / Soy sauce spoonfuls of Ketchup forgotten ingredients etc and most importantly a box with some kind of heating element 🙂

Posted : 19/11/2025 10:59 pm
cwbullet
(@cwbullet)
Member
RE: Prusa Filament Dryer excellent addition

That is incorrect.  I don't think you understand the difference.  The Polydryer is an authentic dryer.  It will keep your filament dry and remove moisture.  The Prusa dry box will keep a roll dry, but does nothing for wet filament.   That is $80.  A dry box from Prusa is $32, and it is $29.99 from Polymaker.   I will buy a few Prusa boxes, but only to use on the sides of Prusa printers and keep the filament dry.  

I currently own a dozen of the Polymaker versions, and they work great.  I have four dryers and 12 or so containers.  

Posted by: @butters

$50 in my currency. The Prusa DryBox is the best solution, at two it's cheaper then the Polymaker link suggested above. With this drybox all moisture is removed from the filament ?

 

--------------------
Chuck H
3D Printer Review Blog

Posted : 19/11/2025 11:07 pm
Butters
(@butters)
Estimable Member
Topic starter answered:
RE: Prusa Filament Dryer excellent addition

I'll just get a dryer and a filament dry box from Prusa see how it works out. I understand what you mean along with the other reply about the differences. 

Posted by: @cwbullet

That is incorrect.  I don't think you understand the difference.  The Polydryer is an authentic dryer.  It will keep your filament dry and remove moisture.  The Prusa dry box will keep a roll dry, but does nothing for wet filament.   That is $80.  A dry box from Prusa is $32, and it is $29.99 from Polymaker.   I will buy a few Prusa boxes, but only to use on the sides of Prusa printers and keep the filament dry.  

I currently own a dozen of the Polymaker versions, and they work great.  I have four dryers and 12 or so containers.  

Posted by: @butters

$50 in my currency. The Prusa DryBox is the best solution, at two it's cheaper then the Polymaker link suggested above. With this drybox all moisture is removed from the filament ?

 

 

Posted : 19/11/2025 11:34 pm
Butters
(@butters)
Estimable Member
Topic starter answered:
RE: Prusa Filament Dryer excellent addition

I wish that there was a dyer that would attach to the side of the CoreOne, rather then having a separate unit. 😶 

Posted : 19/11/2025 11:35 pm
cwbullet
(@cwbullet)
Member
RE: Prusa Filament Dryer excellent addition

Good.  The bottom line is that the Prusa box is not a dryer.  I also have a filament dry cabinet made from a camera cabinet.  It is for long-term storage.  

Posted by: @butters

I'll just get a dryer and a filament dry box from Prusa see how it works out. I understand what you mean along with the other reply about the differences. 

Posted by: @cwbullet

That is incorrect.  I don't think you understand the difference.  The Polydryer is an authentic dryer.  It will keep your filament dry and remove moisture.  The Prusa dry box will keep a roll dry, but does nothing for wet filament.   That is $80.  A dry box from Prusa is $32, and it is $29.99 from Polymaker.   I will buy a few Prusa boxes, but only to use on the sides of Prusa printers and keep the filament dry.  

I currently own a dozen of the Polymaker versions, and they work great.  I have four dryers and 12 or so containers.  

Posted by: @butters

$50 in my currency. The Prusa DryBox is the best solution, at two it's cheaper then the Polymaker link suggested above. With this drybox all moisture is removed from the filament ?

 

 

 

--------------------
Chuck H
3D Printer Review Blog

Posted : 19/11/2025 11:36 pm
cwbullet
(@cwbullet)
Member
RE: Prusa Filament Dryer excellent addition

Not exactly what you asked for: 

https://www.printables.com/model/1253387-core-one-polydryer-shelf

https://www.printables.com/model/1384864-core-one-polydryer-shelf

https://www.printables.com/model/1367903-polyheater-for-core-one-foldable-polydryer-chamber

The last one is to use the ehater as a chamber heater.

I love printables.  

 

 

 

Posted by: @butters

I wish that there was a dyer that would attach to the side of the CoreOne, rather then having a separate unit. 😶 

 

--------------------
Chuck H
3D Printer Review Blog

Posted : 19/11/2025 11:49 pm
Share: