- Introduction, Filter Assembly Box, Filters
- Automatic Fire Extinguishers
- Enclosure Material Options
- Alternative Filter Assemblies/Ventilation Unit
- Various DIY Enclosures
- My Enclosure
Note: Contents of this post are subject to change without notice. All links are non-affiliate. I do not receive monetary compensation from link clicks.
As 3D printers emit both VOCs and EFPs (see previous post), two types of filters are needed; HEPA and Carbon. The two filters and a fan comprise a filter assembly box. The assembly can be made to exhaust or recirculate air.
Per Louisana’s Energy Curriculum Guide – “The recommended minimum filter surface area is 2.50 cubic feet per minute (cfm) per square inch of filter area” for heating ventilation air conditioning (HVAC) systems. My 24″ x 24″ enclosure is 8 cubic feet. Using a calculator for fan air exchange, 9 cfm are required for a fan. I estimated I needed a 4″ x 4 “‘ filter.
Dimensions 120mm x 120mm (4.72″)
Zortrax HEPA & Carbon Filters “Includes 3 HEPA filters and 3 carbon filters.” Package Dimensions 5.1 x 5 x 3.4 inches
$43.20 & FREE Shipping
(Does not ship to U.S.) Nilfisk advance small appliance vacuum cleaner parts.
Model design by Sandra James. File can be adjusted in Tinkercard.
Virgin coconut shell bulk activated carbon.
More information about filters: HEPA Filters and ULPA Filters Information- Engineering 360; Hepa Filters; How Long Do HEPA Filters Last?; Flow Rate, Velocity, Pressure Drop Chart; technical data; Complete Guide to Activated Carbon; Carbon Depth Chart.
HEPA filters are resistant to airflow, requiring a static pressure fan.
“Concentrated Compression Blade (CCB) for high-static pressure of demanding applications such as radiators, the CCB is engineered to focus the inner weaker circle of air outwards, allowing the outer section to pressurize and compress the air.”
“Tuned for high pressure air delivery directly to components.”
“The PH-F120MP, a high static pressure fan, can have the ability to overcome the airflow restriction caused by high fin density.”
“This 12 volt DC fan gives you extremely high airflow of 185.87 CFM and extremely high pressure of 12.15 mmH2O at a maximum speed of 4200 RPM and 58.7 dBA of the noise level.”
“PARAMETERS: Size: 4.72×4.72×0.98 in | Bearings: Dual Ball | Voltage: 12V | Current: 0.45 Amp | Air Flow: 114 CFM | Noise: 49 dBA | Lifespan: 50000 Hrs”
$79.95 for pair
22″ x 22″
$42.99 + Free Shipping
48 in. W x 78 in. H x 24 in. D
22” x 15” x 30”（L x D x H）
22″ x 18″ x 35.4″ (L x D x H)
$159.95 + Free Shipping (marked down price)
Kit includes v-slot, v-slot handles, 3 way end corner, metal hinges, and slot cover. Panels are not included.
starts at $260.99
Alternative Filter Assemblies/ Ventilation Unit
By DanielSchweinert. Uploaded to Thingiverse on January 13, 2020
By sn4k3. Uploaded to Thingiverse on August 12, 2019.
By DeepSilence. Uploaded to Instructables on April 18, 2018.
By jmillerfo. Uploaded to Thingiverse on June 21, 2017.
By ragingrivers. Uploaded to Thingiverse on August 8, 2016.
“This is a printable kit for your 3D printer enclosure including all non printable parts for alveoONE or alveoONE-R + both STL files. Print and assemble your printerbox yourself: free stand or wall mounted type in your favorites colors and maetrials.”
Various DIY Enclosures
By Schweinert. Posted November 7, 2018. A metal, wall mountable cabinet is used as an enclosure.
By Silverlane. Uploaded to Thingiverse on June 26, 2018. This enclosure was made with a Lack table from Ikea. It has a front and right side door.
By Raging Computer. Blog post dated July 3, 2017. Raging Computer wrote that he made his enclosure to control noise.
By jmillerfo. Uploaded to Thingiverse on June 22, 2017. The enclosure has an extruded aluminum structure with plywood back panel, bottom, and top; acrylic sides and door. Jmillerfo designed a filter assembly for the enclosure (see under Alternative filters).
Blog post dated April 19, 2018.
This two door enclosure is two years old. I am pleased with practically all of the design decisions I made. One error I made was in designing the filter assembly. It was not until my recent round of research that I learned the carbon filter should be changed often and easily accessible compartments are needed for both filters.
I did not know until recently that the HEPA filter I used was unacceptable. Not because it was not a good HEPA filter, but because I ripped it while trying to remove it from its case, where it should have remained. I know now that the filter must remain potted in its case to be effective.
One other change needed for the enclosure was insulation around the doors. I will be using rubber window seal to correct this.
Enclosure Update, July 2020
For this update, I sealed opening edges with window seal; changed the door handle; removed the hooks and latches; added magnetic door closure; and created another filter assembly. The filter assembly is explained in another post. I will be making another filter assembly sometime in the future.
The magnetic closure was made using angle irons and repurposed magnets from alarms I purchased from the dollar store. Here is a link to the print file for the magnet holder. I stopped the print to place the magnet before reaching the top cover. The magnet was not a tight fit in the cavity, but it holds well for door closure.