update

Readme.md

@@ -107,7 +107,7 @@ _**nt_horizontal_angle** and **nt_vertical_angle** :_ \[_default=20° and 30°_\
 
 The mask diameter is standard to 22mm (set yt _**imc_max_outer_diameter**_).
 
--**imc_length** :_ \[_default=20mm_\] Length of the connector of the insuflation mask. Can be adapted to your specific mask.
+_**imc_length** :_ \[_default=20mm_\] Length of the connector of the insuflation mask. Can be adapted to your specific mask.
 
 ### 3.d - Strap holder parameters
 
@@ -137,16 +137,30 @@ We didn't put in the directory the _.stl_ files for this version as it would hav
 
 ### 4.a - _Older version :_ Interfacing with the face
 
-_Coming soon !_
+This older version used a mold to mold a skirt that then creates a good seal with the face. For this skirt to be effective, the face measures have to be quite precise.
+
+In the past we used _silicone caulk_ for both this skirt and the _one-way valve membrane_. Although this is mechanically sound, this degases armfull checmical, and can thus not be worn safelly for at least wees or month if ever. We thus recommand either refining the modling technique to use pourable silicone, or making moldable silcone from pourable two-parts silicone and a filler material like corn starch. **Do your own experiments !** 
 
 ### 4.b - _Older version :_ Filter canister
 
-_Coming soon !_
+The integrated filter canister is assembled and printed in the same way as the we provided in the repo and submodule [distorsion/3D-printed-parametric-respiratory-one-way-valve](https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-40mm-gaz-mask-canister).
+
+The nato compatible canister simply consisted in an adapter that would provide a base to connect a 40mm gaz mask to the same component as the integrated canister. There is also an adapter that connects to the gaz mask like an integrated canster and converts it to a 40mm gaz mask. This adapter is requiered as it also hold the one-way valve, which with an integrated canister is held in by the canister.
+
+everything can be printed without support, except the canister cap which can be printed face down with support only the the central hole.
 
 ### 4.c - _Older version :_ One way valve
 
-_Coming soon !_
+Here the one way valve consist of an insert holding a silicone membrane, which can either be molded or cut off of a silicone sheet.
+
+We chose to not use this design anymore as such a soft but small valve, while providing the same (_or even a lower_) cracking pressure as the larger stiffer membrane of the newer design, has the issue of letting air pass when there isn't a high enough negative pressure to close the membrane.
 
 ### 4.d - _Older version :_ Short explanation of parameters
 
-_Coming soon !_
+As with the latest version, parameters are color coded, as is explained in the begining of the **Spreadsheet**.
+
+Structural parameters are largely the same between this version and the newest version.
+
+Parameters that are presented in gray are target values that can be applied to other parameters (_that share part of the name_) to obtain a certain effect - _mainly using the integrated canister or having the minimal size to use the nato-adapter with a 40mm canister -; which can also be done by seting to **O** istead of **1** the \"_direct mount (1) or nato thread mount (0)_" field associated to the _**dm1_nt0_selector**_ parameter.
+
+You will also need to enter face measures, which are denoted by a pink color. You can check "_mask_body -> face_interface -> Boolean -> mask_body_lip -> Pad011 -> **Sketch020**_" to understand the exact meaning of each parameter, and thus how you should measure your own face.