Here in the UK (and we suspect globally) face masks are in desperate short supply. We are keen that the efforts to develop and supply any alternative masks benefit everyone OPENLY and are not used for individual gain or corporate kudos / profit. Hence this post.
As many of you will have seen Copper 3D have offered a copper impregnated material for FDM Printing of face masks, even though our own FDM printers are only used for prototypes we have spent a lot of time over the last 72 hours to try the STL files that were offered on the CU3D website for a mask, unfortunately the mask is difficult to fit and assemble, at best it fits poorly.
We have also struggled to get their copper impregnated FDM material. (We have secured a small supply of it though)
The idea of copper to destroy virus cells is a well established and well researched principle. Of course in todays fast developing global emergency its going to be hard to properly test any masks. However we feel its better to have something than nothing.
It makes good sense to have a copper surface on a well fitted mask.
So the starting point for us is a mask that fits reasonably well. Our own efforts are free to download from this link: https://www.dropbox.com/sh/takagqkbc3okn6d/AAA8utezr5gqvQaYWmi0AHgPa?dl=0
If any of you guys can improve it or offer ideas for improvement then please post on here the improvements - I am certain we will all learn something from each other. sharing ideas openly.
Our next task is to try to work out how best to coat an SLA print with a copper surface, any ideas would be a great help.
We are looking at conductive coatings and using the SLA print as a base for a copper electroplated surface.
The images below show the original from CU3D, both in its printed flat form and fully assembled.
The fit to the face was poor and assembly was difficult.
The design in the drop box link has a much better anatomical fit (90% of all people will find the fit is good, people who have small or very large faces will find that adjusting the face mask print by scaling up or down the STL file a few percent will achieve a good fit.
The front, is simply secured with adhesive to the mask. The copper filter fits next and is held in by a screw fit bung (as per the CU3D design) Fixing to a face is by elastic web 15mm wide
The copper disk and surfaces shall be common to both designs.