I want to be able to print with ABS, ASA, and maybe eventually PC on my respectably modified Ender 3 (I know) without giving me or my cat permanent brain/lung damage.
I haven’t been the greatest on documentation for this one. But essentially, here is the checklist I have:
- Design and build the box
This was done in FreeCAD in June-July '23. I built it out of wood furring, 3/4" plywood for the base, 1/8" plywood for the back and top, and clear polycarbonate for the door and sides. I filled the inside with copious amounts of silicone caulking. Maybe overkill, but it’ll help me sleep at night.
Above, the partially-completed box with what may appear to the untrained eye to be a 3D printer. It is actually my cat.
- Implement adequate ventilation that can be opened and closed to the outdoors
I made some custom parts on the aforementioned printer, including a duct section with a 90-degree bend in it, with room for a PC fan (to be run after a print), as well as a wall mount. The wall mount is just mounted to some MDF I found at my school’s senior design lab. The interface to the box has a place to mount a shutter later, so that I can remotely open and close the enclosure to the outdoors when a print ends or starts. You may be thinking that the prints might be a bit porous. Obviously, with the lengths I went with the caulking, this is a weak spot. You might be right. YOLO.
The outside of the back of the enclosure is shown with the 90-degree duct containing the fan.
The inside of the back of the enclosure, where you can see the fan behind the stationary part of the shutter.
- The shutter (I’m here now)
The shutter is to be controlled by an ATMega328P connected to my OctoPi (A Raspberry Pi 3 running OctoPrint). The shutter is turned by a little stepper motor I got off of some 2D printer I took apart years ago. Nominally, it runs on 24 volts, but I’ve tested it and I think I can get away with 12 volts. True, the Ender 3 runs on 24 volts, but I need to drive the fan with 12 volts anyway, so I might as well underdrive the motor as well. I’ll do this with a PC power supply most likely.
I have the shutter designed, printed, and mounted on the motor, the mount to the inside of the enclosure likewise completed, and a plated perfboard halfway completed for the ATMega328 and motor driver ICs. I considered programming the ATMega328 on bare metal, but I’m familiar with Arduino, and I just want to see this thing working. Maybe later.
The code is in progress.
I’m content with this little bit of documentation I have up even if nobody reads it. It’s a start!
If anyone does see this, though, I would appreciate thoughts and feedback!