NATO/STANAG 40mm thread to twinn DAR adaptor v1.0

thingiverse

Twin DAR Filter Adaptor for 40mm NATO/STANAG Thread. Used in PANORAMASQUE Example. https://www.honeywellsafety.com/Products/Respiratory_Protection/PANORAMASQUE.aspx?site=/europe To be used with two standard DAR filters. For Single DAR Filter Version, Look Here: https://www.thingiverse.com/thing:4285159 This design solves common problems with many other twin filter adaptors - random position of filters when adaptor is screwed-in. At the beginning of the thread, there's a place/slot to press-in standard soft O-Ring of size 30x3mm (30mm is internal diameter of O-Ring). Elasticity of the O-Ring gives necessary space to turn adaptor into proper position. See attached pictures. Adaptor slot cross-section is little more than half of circle - so O-Ring is locked in place nicely. The filter cones are designed according to ISO 5356-1:2015 standard, with FDM 3D printing technology in mind. This version needs no support. There are many misunderstandings regarding the NATO/STANAG thread vs standard RD40mm. Good explanations can be found here: https://gasmaskandrespirator.fandom.com/wiki/Thread:11144 and here https://youtu.be/lXPNuyp4ek4 Print Parameters: - Material - PET-G - Nozzle max 0.4mm - Layer max 0.2mm - Perimeters - 5 - Top/bottom layers - 5 - Infill density - 40% - Infill pattern - Concentric or Grid - Seam position - Random - Solid Infill Threshold Area - 70mm2 For best results with O-Ring slot, it's recommended to use thinner layer for first 2mm. The 0.1mm is perfect. For details ask in comments. Files in Project: - <b>NATO_STANAG_40mm-2xDAR_adaptor_v1.0.stl</b> - adaptor - in ready to print position Project is continuously improved in close cooperation with: Warsaw University of Technology Faculty of Automotive and Construction Machinery Engineering. Print and use at your own responsibility.