The BE Mask v1.3.4 (Buffalo e-NABLE Mask) is a derivative of the original Montana Mask. This derivative work focused on design changes to improve fit for a variety of individuals and to improve sealing of the mask and face (i.e. minimize leakage). * * * * * Update 4/9/2020: Adjusted scaling to allow for 2 pieces of filter material, as recommended based on preliminary testing results. Update 5/12/2020: Updated to v1.3.0, including a number of changes: * All models have been recreated from scratch as solid-body models (v1.0 was based on modified mesh files) * Consolidated to three sizes (small, medium and large) * Thicker protective grid on front of mask * Added fillets to protective grid for improved printing * Redesigned strap connectors for cleaner printing * Made mask walls slightly thinner for improved flexibility * Version number included on mask body interior * Sizing indicator (“S”, “M”, “L”) included on both mask body and filter frame insert Update 5/15/2020: Updated to v1.3.1, including the following changes: * Minor adjustments to sizing based upon latest facial analysis results from Buffalo / e-NABLE team Update 5/18/2020: Updated to v1.3.2, including the following changes: * Sizing adjustments to sizing based upon user feedback Update 5/28/2020: Updated to v1.3.3, including the following changes: * Adjusted the position of the strap connectors so the elastic doesn’t end up so close to the eyes when wearing the mask * Enlarged the filter housing in the mask slightly so the filter frame isn’t quite as tight Update 6/2/2020: Updated to v1.3.4, including the following changes: * Re-shaped the strap connectors for improved printability (tapered edges) * Enlarged the strap connector openings to make it easier to install the elastic straps Video overview here: https://www.youtube.com/watch?v=sfkIDq3Xo-4 Fabrication and Post-Processing Guide video here: https://youtu.be/PKCFASmITgI DISCLAIMER: =========== The 3D printed mask 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. Please be aware that this mask design is not intended to replace standard protective equipment such as N95 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. The individuals associated with developing and producing this mask design assume no liability and make no representations, warranties, or guarantees regarding the safety, efficacy, or appropriate use of these masks in any particular situation. Each facility should test each batch of masks prior to relying on them for protection. Use of this information for any purpose is at the maker’s and user’s own risk. * * * * *