Earguard / Salvaorejas 20mm [TESTED] [COVID 19] [PRINT 12 in 32 min]]

thingiverse

TRACTION RESISTANCE TESTED EARGUARD English translation will be coming soon **ATTENTION!!** I wanted to show that 0.8 of total thickness is not only the most comfortable option, but it's more than enough to withstand the tension of the earpiece of the mask, so I made a study of the force that these ear guards can withstand. In the files you will find a PDF with all the data and a link to a small video that reflects the methodology followed for this small experiment (in addition to a slow-motion video very cool in which part of the ear guard is seen) [Direct link to PDF here](https://thingiverse.com/download:8153478) This ear guard is inspired by [Notthi's ear guard](https://www.thingiverse.com/thing:4270123). This ear guard is designed for masks that have very short elastic. That is, for the masks that when you pull on the elastic to its maximum barely leave a cm between the elastic and your ear. On my Anycubic Mega S plate, 12 ear guards fit very tightly. The printing time with the settings I give you is approximately 30 minutes for 12 ear guards. The design is optimized to print very quickly at 0.4mm of layer height and 0.6 of line width. This is very convenient: it reduces the printing time and makes the piece stronger. These are the printing parameters that I use: * Layer height: 0.4mm * Line width: 0.6mm * Wall count: 12 * Optimize print order: YES * Compensate wall overlaps: YES * Fill gaps between walls: NO * Horizontal expansion: -0.2mm * Initial horizontal expansion: 0mm * Flow rate: 110% * Outer wall speed: 50mm/s * Inner wall speed: 80mm/s * Top/bottom speed: 50 mm/s * Small part speed: 80% * Initial small part speed: 80% * Printing temperature: 200°C (this temperature is 10% higher than the one normally used with this material, necessary to compensate for the increase in volume of material extruded per second. If you are going to print according to my parameters remember to increase the temperature you normally use with that filament by 10%) In an ear guard, the main force applied (the traction made by the elastic of the mask) is in the same direction as described by the line with which the layers are printed. These printing parameters achieve a greater resistance to those forces, by reducing the dependence on adhesion between layers since the larger the section of the extruded lines, the fewer walls will be; depending thus more on the excellent characteristics of PLA and less on the result of the print. (No matter how good quality of print you get, adhesion between layers will always hinder mechanical capabilities of traction). For more information about how to increase layer width improves the properties of the piece, you can consult [this CNC kitchen video](https://www.youtube.com/watch?v=9YaJ0wSKKHA) Written with [StackEdit](https://stackedit.io/)