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Home» Education» 3D Printing Tutorials»Food Dehydrator to Filament Dryer DIY, Don’t Toss Wet Filament!
Food Dehydrator

Food Dehydrator to Filament Dryer DIY, Don’t Toss Wet Filament!

Andrew Delisle 02 Feb 2022 3D Printing Tutorials, Education, Filament Tutorials 7 Comments 12974 Views

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Table of Contents

  • Sadness Strikes
  • Option #1 Count Your Losses
  • Option #2 Bite The Bullet
  • Option #3 Do It Yourself
  • The Build Materials
  • Let’s Destroy A Food Dehydrator
    • Step One:
    • Step Two:
    • Step Three:
    • Step Four:
    • Step Five:
    • Step Six:
  • Dehydrator Drying Chart
  • DIY Food Dehydrator Conclusion

This tale is about turning your average food dehydrator into a 3D filament dryer. Storing hygroscopic filament correctly is very important. Hygroscopic means that the filament can absorb moisture from the air puppet. I store all of my filament, even my PLA, in lockable totes with foam seals and desiccant packs. If you’ve ever had a water logged roll of filament, ruin your day, read on and prepare to be amazed!

Sadness Strikes

Regardless of how I have been storing my materials, something terrible happened. My Ninjaflex TPU filament absorbed water. As I was heating up the hotend on my ever so reliable and slightly modified Tevo Black Widow, I heard the telltale signs that dancing blow-up thing something was amiss. There were some slight sizzling and a couple of weird popping noises. Instead of a solid stream of filament slowly streaming out of my nozzle, I was greeted with a sputtering bubble of liquid goo.

Whelp, that’s depressing! I needed to finish the printable joints on this new 3D printed hand that I was printing. After lowering the temperature of the filament 10c from what I normally print at, the filament looked a little better when extruding. 

I pushed the print job through regardless of the printing temperature and hope for the best. The job finished, and the part seemed strong. The surface quality was rough and textured. Not the smooth finish with almost invisible layers that I am used to seeing in my prints. I checked the other inflatable advertising tube hygroscopic filaments in my possession. Both rolls of Ninjaflex TPU, two rolls of PETG and my roll of Nylon were both water logged messes. So now, I had three options.

 

Food DehydratorOption #1 Count Your Losses

Toss the materials and next time try harder at not being terrible at storing my filaments. The problem with that, is these materials aren’t really cheap. If I were to just toss these in the bin and count my losses, I would be over $100 out of pocket in filament. UNACCEPTABLE!

Option #2 Bite The Bullet

Buy a filament dryer. Well, there’s a perfectly excellent solution to every problem to buy the thing that solves it. In this case, it’s a device that costs over $100. Well, spending $100 to save $100 isn’t the best math for bargaining a purchase. Yes, it has the benefit of stopping this problem if it every rears it’s ugly head again. The problem is, sometimes $100 just isn’t in the budget.

Option #3 Do It Yourself

DIY Yes, this is more up my alley. I decided to simply listen to ‘Run What Ya Brung’. Essentially, this means to find something around the house that suits my purpose. Sadly, the minimum temp on our oven is 180F/82C. To stay far below the classification and melting temperatures of my filament, this is too high. We also have a small toaster oven, and the temperature range is good for drying.

The problem is the size of the toaster oven. The complete filament spools will not fit in there. I didn’t want to have to measure what would be needed, cut it off and just dry that. I wanted my filament dryer to dry the whole spool at once, and that’s when it came to me.

A food dehydrator! It’s circular, can be modified to fit entire rolls of filament, steady stable temperatures and most importantly, it’s cheap! It’s temperature range also matches up nicely with all of my materials. My amazing wife forbid me from mutilating ours, so I went on Amazon and got the highest rated unit in my price range. I’m not a ‘Prime’ member, so it took four days to get to me. Now comes the part you all have been waiting for.

 

The Build Materials

What you will need to make your DIY Filament Dryer:

A food dehydrator big enough to fit your filament spoolsA file
A set of side cuttersSafety googles and gloves

I am sure that you noticed the last couple of things on that list: safety apparel. It’s a requirement. You don’t want a razor sharp piece of acrylic flying into your retina and permanently blinding you all in the name of 3D printing. After making sure you have everything you need, make sure your dehydrator will fit the filament in it.  We want the total height of the racked area to fit your spool. After all of this is checked, let’s start cutting!

Let’s Destroy A Food Dehydrator

Step One:

First, set aside one rack from the dehydrator. This will be our base rack where the filament sets. The rest will be chopped up and used as risers for the lid to clear the spool.

Step Two:

Start clipping and work your way around the rack. Mine went really easily, and each rack took under 2 minutes.

Step Three:

After you have the rack bottoms snapped out, use the file to clean up and sharp edges remaining on the inside of the rings. You don’t want to accidentally lose a digit.

Step Four:

 Stack the cleaned up rings on top of the untouched rack and place the whole thing on top of the dehydrator base.

Step Five:

Lay the water logged spool inside of the modified dehydrator.

Step Six:

Set the temperature and let it sit for the appropriate amount of time. Remember, the listed values are MINIMUM times.   (Check the table at the bottom of the article)

Food Dehydrator
Food Dehydrator
Food Dehydrator
Food Dehydrator

 

Dehydrator Drying Chart

Here are the temperatures and drying times taken DIRECTLY from PrintDry.com

MaterialDrying TempratureDrying Time
PLA45C/113F>4h
ABS60C/140F>2h
PETG65C/149F>2h
Nylon70C/158F>12h
Desiccant
65C/149F
>3h
PVA
45C/113F
>10h
TPU/TPE
50C/122F
>4h
ASA
60C/140F
>4h
PP
55C/131F
>6h

DIY Food Dehydrator Conclusion

So, the moral of this story is proper storage of your filament is key. Make sure you are storing your filaments in the proper containers with fresh desiccant packs. When using nylon, water absorption is almost unavoidable. It literally wicks water out of the air as you are printing! Some filaments are less susceptible to water absorption, such as PLA. Using this dehydrator or any kind of filament dryer will improve your print quality and your printing experience.

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3d printing dehydrator diy dryer dry filament drying filament filament dryer nub werkes 2022-02-02
Tags 3d printing dehydrator diy dryer dry filament drying filament filament dryer nub werkes
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Authors

Posted by : Andrew Delisle
I'm a father of four, happily married, IT professional with nearly 15 years in the field. I live in Michigan and have been 3D printing since
Previous Article :

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7 Comments

  1. Glen
    May 23, 20181:00 am -

    Having used the oven method several times to get moisture out, I can say that 175 degrees F has worked for me. I would how ever prefer to use a dehydrator, just have yet to take the time to destroy one…

    Reply
  2. Andrew DeLisle
    May 23, 20181:46 pm -

    Thanks for the comment Glen, what type of filament were you drying? 80C just seemed too hot to me for anything but Nylon. I just tried an older roll of PLA and got some popping and sizzling, might have to dry this roll out as well. It’s over a year old though.

    Reply
  3. Paul
    February 14, 201910:26 am -

    Be aware that the internal thermostat is a bimetal type and it is positioned before the heater element.
    So it is very inaccurate.

    Reply
    • Andrew Delisle
      February 14, 20196:53 pm -

      Thanks for the info Paul! I’ve been using this method since I made this tutorial and haven’t had any issues yet. I do keep the temp for PLA and TPU low, the other materials that I commonly use are nylon and PET-G. I don’t think this will get hot enough to cause issues with them, but it is something that I will keep an eye on.

      Reply
  4. Eildosa
    September 7, 20197:30 am -

    I am still left with 2 trays that can be used for food.
    Do you think that it is safe to use it to dry meat event after having used it to dry PLA?
    Thanks.

    Reply
    • admin
      September 7, 20198:55 pm -

      me i wouldn’t i try to keep everything separate

      Reply
  5. Adam Wiseman
    February 17, 20204:55 pm -

    It would appear that PrintDry have changed several of their recommended temperatures and times in the table on their site. Nothing major, but for the sake of consistency, you might want to update your table since you link to theirs.

    Reply

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