You still keep the packaging foams from the A1 mini box, right?

[kylejustknows]

I tried drying the filament by putting the filament box on A1 mini hotbed. Doesn’t work.

I realised the issue is: The hotbed gives less “power” than the box leaks, so the temperature could never be reached.

So…for small time players with 2~3 rolls of filaments, who don’t want to spend extra money and space on drying equipments, this is for you:

Fit tightly!

Cutting the foam is super easy. Fully cover a filament box with the help of some silicon glue. That’s it.

Tested on a filament roll for 6 hours:
The bottom of the roll is -5 degree cooler than hotbed.
The top of the roll is -10 degree cooler than hotbed.

Works so much better than my estimation that, I accidentally melt my first whole test roll of PLA!

Enjoying saving $50!

(for the people who are super super lazy: cut a big hole in the bottom of the filament box, put the filament and the box on the hotbed, using a big plastic bag wrap the whole thing with a little hole to let steam out…works too)

[Bisti]

Nicely done !
I’m curious of one thing , if you cover the exterior of the foam does the wall loose less heat? I’m asking this because in theory the open foam cells will loose some heat due to convection, especially on the outside where the air moves much faster.

[kylejustknows]

I have thought of that as well! I blow air with my mouth onto the “foam sheet” and found that the air can not pass through even when the layer is thin. So the convection doesn’t exist.

Although it currently meets my need, if it goes any further, the heat transfer by radiation is in the question, as the foam is black. I could spray pain the in-and-out to be silver/white, or use aluminium foil to wrap it all up.