Dryer filament box

Hi

I started to make a filament dehydrator.
It can grow in my first test, the temperature of 75 ° C.
I hope soon to reach 85 ° C.
Control takes place with an electronic controller.
I heat all with resistance.
The air is mixed by a small fan which is resistant to 85 ° C.
I can put a 2kg spool.
It is put on bearings to rotate freely.
The drier is connected to the printer.
Thus, the filament is dehydrated during printing.
Everything is powered by 220V / 110V.
We can also add wall cylinder on the top to store more than 1 spool : max 3 spools of 2kg or 6 spools of 1kg.

What do you think ?
Attachment 8667

I think launching a kickstarter.

The container looks sealed, where does the moisture go? What are the three slotted fins on the inside doing?

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Originally Posted by Marrrs

The container looks sealed, where does the moisture go? What are the three slotted fins on the inside doing?

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Moisture is absorbed by the silica gel that is put at the bottom of the tank.
The fins keep the filament in the spool.
They prevent it from leaving it.

Have you calculated the mass balances and equilibria for this? In any case you will need a means to regenerate the silica gel, or else have a truck load of it available.

You can find some good info here: http://www.apsnyc.com/uploads/Demyst...lica%20Gel.pdf

And also beware that RH (relative humidity) is a poor unit of measure as it is temperature dependent and relative. As you need to physically remove water and get rid of it (grams of water), it is better to calculate with the absolute humidity instead, as the water equilibria of polymer<->air and air<->silica both depend on the actual concentration of water in air (expressed in grams/m3).

Maybe a better approach would be to design a miniature air conditioner unit with a peltier element and collect and drain off the condensed water to outside the container.

Silica gel does not remove moisture when warm, it gives it out.

Cardboard boxs, duct tape, dryer exit hose and an de-humidifier unit is what you need.

Hats off to the OP for attempting to make our world a little better. Hopefully with positive community feedback he can come up with something niche-filling...

I think that a Peltier pump in there to collect the water would work with a heater and something to take the water away. Like a small dehumidifier.

You could probably make something quite easily with a small wine fridge as your starting point.

first off - for basic abs and pla 85c is way way too hot !

bear in mind that rolls of filament are very tightly packed. heating nthem to that temperature for any period of time will actually create a big lump of semi bonded plastic.

Also if the printer is drawing filament at 85 degress out of the dehydrator - that is very soft filament which will stretch, causing change in filament diameter and completely bollixing up your prints.

You need to be running it at around 40-50c with active air movement to remove the moisture.
It has to be a good way below the glass point of any filament or the minimum issues you get from 'wet' (I've never actualy had a problem) filament will be massively overshadowed by the problems caused by hot filament.

Yes I will try to dry with peltier plate
Also, actualy I can adjust the temp from 20 to 75. Effectively 75 - 85 deg is to muche for printing
Thanks for your help

I would imagine a larger container with one side having warm, dry air (not above 60c as mentioned) pumped through, while on the other end a vacuum of sorts suck out the air. You could have underneath a bed of silica gel beads (maybe with a removable, air sealed tray), and of course the air pump IN would have to be stronger than the air vacuumed OUT, to give time for the filament to dry out.

We use large plastic boxes, with lids, that will hold 16 spools each,
with a container of desiccant in each.
If you have more than one spool, a container like your design is Not much help.

I found a desiccant container at thingiverse.com
so I printed several of them to go in our spool-boxes.

The boxes and containers have been Great !