The Moldable Mask

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About the Moldable Mask

The Moldable Mask is a 3D printable mask that can be molded to the userís face using hot water. It is intended for use during the COVID-19 pandemic in cases where there is a shortage of personal protective equipment (PPE) such as N95 respirator masks or surgical masks.


The Moldable Mask was developed by a Ph.D. student, Erica Martelly, and her academic advisor, Professor Kenji Shimada, at Carnegie Mellon University in April 2020. The mask design was submitted to AmericaMakesí Mask Design Challenge and was selected as one of the top two designs. Two students, Charles Li and Alana Toy, joined the team in May 2020 to further improve the design.



Download Mask STL File

Start by measuring your face to determine the appropriate size. Measure the height of your face by finding the distance from the bridge of your nose (between your eyes) to the bottom of your chin. Measure the width of your face by finding the points on each side of your face where your jaw begins. You can find this by opening and closing your mouth and finding the movement point. Measurements do not have to be perfectly accurate.


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Once you have your face measurements, use the chart below to determine which size is best for you. The filter cage is the same for all masks.



Width (mm)

Height (mm)

Shorter than 110mm

Narrower than 135mm

Wider than 135mm


Small - Wide

110mm Ė 120mm

Narrower than 140mm

Wider than 140mm


Medium - Wide

Taller than 120mm

Narrower than 145mm

Larger than 145mm


Large - Wide


You may also download all the STL files as a single zip file (9.4MB): Download all the mask STL files.



Download Filter Cage STL File

Download Filter cage STL file.

(The filter cage is same for all the mask sizes: Small, Small-Wide, Medium, Medium-Wide, Large, Large-Wide).


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Assembly Instructions

Download Assembly Instructions

Please read the instructions carefully prior to the usage of the Moldable Mask.The instructions include:
(1) Appropriate usage criteria

(2) Device overview

(3) Manufacturing instructions

(4) Point of Care Assembly and Cleaning Instructions

(5) Appendix A: Recommended Disinfectants and Sterilization Methods

(6) Appendix B: Recommended Materials

(7) Appendix C: Materials in Direct Contact with Skin



Printing the Moldable Masks


If you do not have access to a 3D printer and would like to have some masks printed and shipped to you, please contact:


Matt White

Application/Sales Engineer

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American Additive Manufacturing





This is NOT an FDA approved device. Please see the FDA guidance here.


The information presented here is intended to assist the general public during the current global pandemic related to COVID-19 and the related nationwide shortage of personal protective equipment.This mask design is not intended to replace standard protective equipment such as N-95 masks or surgical masks when that equipment is available. The use of these 3D printed masks has not been fully tested and has not been approved by federal or state authorities.Carnegie Mellon University, Erica Martelly, Charles Li, Alana Toy, Dr. Kenji Shimada or anyone associated with the Moldable Mask do not assume any liability and make no representations, warranties, or guarantees regarding the safety, efficacy, or appropriate use of these masks in any particular situation. Each individual should test their mask prior to relying on them for protection. Use of this information for any purpose is at the makerís and userís own risk.





This work is licensed under a Creative Commons Attribution 4.0 International License.

Downloads - Creative Commons




For technical inquiries contact:

Erica Martelly (emartell A picture containing drawing

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Kenji Shimada (shimada A picture containing drawing

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For media inquiries contact:

Lisa Kulick (lkulick A picture containing drawing

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(Senior Manager of Communications)





Computational Engineering and Robotics Lab
Carnegie Mellon University

2020 Copyrights - All Rights Reserved

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