DIY Closed Loop Controlled Filament Dryer by @jimscuba2386
jimleemhuis/ shares:
One way to dry filament is to put it in an oven. This is great if you want to spend the money on a food dehydrator or your spouse doesn’t mind you putting plastic into your nice new kitchen oven. However, one other way it to use a chamber and a light bulb. This method works well but different materials can require different temperatures due to glass transition temperature (the point where plastic begins to soften). By using arduino, we can build a closed loop control drying box that works similar to your oven. Set your max temperature allowed, your amount of temperature tolerance, the number of hours you’d like to dry and you’re good to go. The controller heats the chamber up to your max set temp, turns the light off until the chamber hits the Max temp – tolerance then turns the light back on again to continue cycling. After the specified number of hours, the controller switches to “Humidity Hold mode”. The user inputs a maximum percentage humidity to hold in the chamber and the controller only turns the light on long enough to keep the humidity below that percentage. It’s a nice energy saver mode if you’re not going to get to your newly-dried filament right away and bag it up. Through our testing, I’ve been able to dry nylon that was submerged in water for a few days and get perfect prints again!
read the full guide on: http://www.instructables.com/id/DIY-Closed-Loop-Controlled-Filament-Dryer/
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