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# Disclaimer
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Copyright CERN 2020, Licensed under [CERN-OHL-P v2](https://ohwr.org/cern_ohl_p_v2.pdf).
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This source describes Open Hardware and is licensed under the CERN-OHL-P v2.
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This source, containing the design of a face mask, is provided by CERN on an “as-is” basis, without any express of implied warranties of any kind, including of merchantability, satisfactory quality, fitness for a particular purpose, compliance with standards or regulatory requirements, or the non-infringement of third party rights in its production, distribution and use.
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# 3D Printing Tips and Tricks
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* Before ordering the TPU filament check if your printer can print TPU as it is, if you have to do some modifications to it or if doesn’t allow you to print TPU;
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* If your filament starts to get blocked around the wheels that push the filament into the hot end try to loosen a bit the screw that defines the pressure between the two wheels;
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* If you get a lot of filament strings inside the mask reduce the speed to 65-70% directly in the printer;
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