this post was submitted on 19 Oct 2024
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75
CNC Kitchen – What is the best way to dry your desiccant? (microwave) (i.ytimg.com)
submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]
19 comments fedilink hide all child comments
 

https://www.youtube.com/watch?v=6tHInlFfMcM

copy of the video description text:Over the years, I've collected a lot of silica gel packages and regularly put them into my stuff, hoping that they will keep it dry. These tests showed me that there is more than silica gel in the typical desiccant packages and that if you don't properly dry them, they can even ruin your filament. Let's compare four different methods to keep your loose desiccant and your silica packages dry!

Chapters
00:00 Introduction
01:19 What's inside a desiccant bag?
01:54 Sponsor
03:19 Clay desiccant
04:57 Indicating desiccant
06:53 The problem with desiccant
10:26 Get rid of your desiccant bags?
11:06 Drying desiccant
14:38 Drying in a microwave
16:40 How much energy does it use?
19:34 Drying the bags in a microwave
21:48 Do you damage your desiccant in the microwave?
23:18 Summary

I'm surprised Stephan did not mention that bentonite clay is commonly used for cat litter.

top 19 comments
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[–] [email protected] 27 points 1 month ago (1 children)

I wish it was more common to add the answer when a title is a question. Don't withhold information to make me consume your content

[–] [email protected] 9 points 1 month ago

I enabled deArrow in my Smarttube installation, and it gave me the title as something like "Dry your dessicant before you use it."

[–] [email protected] 13 points 1 month ago* (last edited 1 month ago) (5 children)

I use industrial silicagel granules that I buy in 5-liter jugs. The granules are blue when dry and turn purple/red when they no longer absorbs humidity. Then I throw them in the microwave for 5 minutes and the granules turn blue again - and scalding hot too.

It's not perfect because it gradually turns more and more silicagel granules to dust as they explode like popcorn. So after maybe 10 to 15 cycles, the silicagel becomes ineffective and the blue granules turn more and more to brown, Then it's time to throw it away and use a fresh batch.

It's possible to extend the life of the granules by drying them in a regular oven at low heat rather than in the microwave at full pelt but it's slow and annoying, and silicagel isn't that expensive, so I don't bother.

[–] [email protected] 16 points 1 month ago

The blue comes from Cobalt Chloride, a very toxic substance. I'd keep that microwave separate from your food. Same with any ovens and dryers you use.

[–] [email protected] 9 points 1 month ago (3 children)

I read somewhere, that the dye is either poisonous or carcinogenic (sorry, no source, I have to search for it again). So I am not sure if putting it in the microwave is the best idea.

[–] [email protected] 9 points 1 month ago (2 children)

Some (usually cheaper) indicating desiccants use cobalt-based dies which are fairly toxic, but unless you are using them to keep food dry it's not a huge issue. Having them break into powder in the microwave probably isn't great though, I'd avoid breathing any of it in

[–] [email protected] 4 points 1 month ago

The orange indicating gel is less toxic, but it's still not good for you. Don't dry any indicating silica gel in the same oven you use for food. The clear silica gel is non toxic, but breathing the dust can cause silicosis.

[–] [email protected] 4 points 1 month ago

I’d avoid breathing any of it in

The powder can settle on your food just like if can settle on your lungs.

I'd recommend not using the same microwave you use for food to dry died desiccant.

[–] [email protected] 5 points 1 month ago

It's in the linked video

[–] [email protected] 2 points 1 month ago* (last edited 1 month ago)

I wasn't aware. I'll look into that. Thanks!

[–] [email protected] 6 points 1 month ago (1 children)

the granules are blue when dry and turn purple/red when they no longer absorbs humidity.

Don't buy those. Orange gel is the "new" blue.

The reason why the blue gel was phased out decade(s) ago is the CoCl2. Along all of the hazards are H350i and H360F (cancer and reproduction [aka. your plan to have kids might not turn out that great]).

While orange gel doesn't have as good of a color change it is significantly lower risk and shall be used.

[–] [email protected] 4 points 1 month ago (1 children)

the blue gel was phased out decade(s) ago

But I can still buy it?

Good advice though. That's why I come to Lemmy: I learn useful stuff all the time.

[–] [email protected] 2 points 1 month ago* (last edited 1 month ago)

China. That's where you can still get the Cobalt indicator and subsequently on Amazon, Aliexpress or ebay.

The upside is the fantastic color change, which is why some still prefer it and why it is probably still being made.

In Europe there is an alternative blue indicator that is cobalt-free, but it is more of a blue to brown/very dark red colour change, so not great either especially after a few drying cycles.

[–] [email protected] 6 points 1 month ago (1 children)

The video specifically calls that method out as dangerous and toxic.

Microwave is fastest but you've gotta do it at an extremely low power setting and he recommends not using it with a food microwave

[–] [email protected] 3 points 1 month ago (1 children)

not using it with a food microwave

The microwave sits in the workshop and is not for cooking food. It's strictly to do nasty stuff with materials I work with.

[–] [email protected] 2 points 1 month ago

Gotcha. The other issue with microwaving it on high settings is they burst releasing a dust of silica and indicating color, neither of which is good to breathe. If you've got good ppe and ventilate you should be fine.

It will kill the color changing effect tho

[–] [email protected] 2 points 1 month ago (1 children)

Perhaps microwaving for significantly longer, at a low power level, would be safer and result in higher success/yield?

[–] Ajen 2 points 1 month ago

That's what I do, never noticed the balls exploding. It takes about 20 minutes, but that's the microwave's time, not mine.

[–] [email protected] 5 points 1 month ago

I moved and my new oven overshoots like crazy on low temperatures, so I can no longer use it to dry filaments. I bought creality’s dryer and so far Im rather happy with it. It is rather noisy but does the job and feeds the filament directly to the printer.