Large 3D printing filament dryer and storage box, with over the top design specs:

• Max drying temperature of 120°C 🔥
• Air-tight construction (not while drying)
• Ability to hold 4×1kg or 6×700g or 1×2.5kg spools

Hot surface. Hot contents. Ensure continuous ventilation.

Warning! Do not attempt to replicate this without experience with handling electricity. This is not an Arduino project. Working with AC current can kill or maim you.

• 🚚 Ammunition Box 47x21x37cm (NATO size 3)
• 🚚 PTC heater 220V 400W 120x50mm
• ❔ Thermostat (ETC-961? REX-C100? ITC-100VH?)
• ❔ High temperature fan (convection fan for the oven?)
• 🚚 Steel threaded rivets M10 ≥6pcs.
• ✔️ PTFE tubing & couplers
• ❔ Alarm light and buzzer
• ✔️ Power switch
• ❔ AC IEC socket
• ✔️ Wire crimper and supplies
• ❔ Alternative gasket material

Goal is to have a basic version for a price of a cheapest commercial dual-spool drybox. At the time of writing Creality Space Pi can be found on Aliexpress for 366zł.

I was able to get surplus ammunition boxes for 100zł (~$25).

I'm not sure what the best heating solution is yet. PTC heater with automatic shutoff at 150°C and with higher power then other commercial dryers have seems safe. Safer then disassembling a hair dryer. It might be under-powered, we will see. It was cheap, at 52zł.

Threaded rivets will make installing ports for printing directly from the box very easy. I got both M4 and M10 from Aliexpress for ~30zł.

Thermostat should cost <100zł. Same with fan and fan motor.

Spent so far: 182zł.

Researching products designed for convection ovens (termoobieg) and DIY meat smoking (wędzarnia) helped. There are no unsolved issues here, just a lot of integration.

• 2024-03-06 - project started, initial purchase - box i.d. 43.5×37×18.5cm

• Glass visor
• Flament rotation motor (oven roast motor?)
• Humidity sensor (needs to be temperature resistant)
• “IoT” reporting and control
• Load cell for spools
• Klipper/printer integration