diff --git a/Readme.md b/Readme.md
index 473c491..3e365de 100644
--- a/Readme.md
+++ b/Readme.md
@@ -11,16 +11,26 @@
 
 :warning: **WARNING : _Please don't use a 3D printed canister (or even our mask) in life threatening situations !_** :warning:
 
+This filter canister works by holding a filtering material - _usully activated charcoal_ - in between two securelly held mask/filter pieces.
+
+The center sleeve is made to hold both the mask/filter pieces, using the pressure of the two outer shell part being screwed in together around the sleeve.
+
 <img src="https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-40mm-gaz-mask-canister/media/branch/main/pictures/canister_plug_picture.png?raw=true" alt="Image not available" height="200" />
 
-_Coming soon !_
+This repository also provides a _plug_ to use instead of a canister for masks that have two threads for canister - _like the one we provide at_ [distorsion/3D-printed-parametric-gaz-mask](https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-gaz-mask) - which you can print from the [3Dfiles/nato_thread_plug.stl](./3Dfiles/) file.
 
 ## 2 - Assembly
 
+Once you have printed all the requiered pieces as described in the [_3D printing section_](#3-3d-printing), the assembly is simply done in three steps :
+
 <img src="https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-40mm-gaz-mask-canister/media/branch/main/pictures/canister_asembly_step1.png?raw=true" alt="Image not available" height="300" />
 
+_Coming soon !_
+
 <img src="https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-40mm-gaz-mask-canister/media/branch/main/pictures/canister_asembly_step2.png?raw=true" alt="Image not available" height="300" />
 
+_Coming soon !_
+
 <img src="https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-40mm-gaz-mask-canister/media/branch/main/pictures/canister_asembly_step3.png?raw=true" alt="Image not available" height="300" />
 
 _Coming soon !_
@@ -29,7 +39,18 @@ _Coming soon !_
 
 <img src="https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-40mm-gaz-mask-canister/media/branch/main/pictures/canister_sliced.png?raw=true" alt="Image not available" height="400" />
 
-_Coming soon !_
+To assemble a full canister, you need to need to print :
+ - 1 _sleeve_ from [3Dfiles/canister_sleeve.stl](./3Dfiles/)
+ - 1 _cap_ from [3Dfiles/canister_cap.stl](./3Dfiles/)
+ - 1 _main body_ from [3Dfiles/canister_main_body.stl](./3Dfiles/)
+
+You can also print a _plug_ to use instead of a canister for masks that have two threads for canister - _like the one we provide at_ [distorsion/3D-printed-parametric-gaz-mask](https://git.deuxfleurs.fr/distorsion/3D-printed-parametric-gaz-mask) - which you can print from the [3Dfiles/nato_thread_plug.stl](./3Dfiles/) file.
+
+There is no particular printing parameters or material requierments to make this canister properly work. Note that every file provided can be printed without support :
+ - print the _plug_ ([3Dfiles/nato_thread_plug.stl](./3Dfiles/)) with the flat face facing down.
+ - print the _sleeve_ with one of the open end pointing down.
+ - print the _cap_ with the flat face pointing down.
+ - print the _main body_ with the 40mm thread pointing down, you can add a skirt to support it better if you fear it falling over mid-print.
 
 ## 4 - Parameters
 
@@ -37,4 +58,14 @@ If you want to changes the parameters of this design, you can edit the _Freecad_
 
 If you want/need to change parameters, we would suggest you play with them and try to understand the impact of each parameters. We will only explain a small selection of important parameters that you are most likely to have to edit.
 
+We will only describe a few parameters that you are most likely to have to change.
+
+### 4.a - Structural parameters
+
+_**wall_thickness** :_ \[_default=2.7mm_\] The wall thickness accross the print (_except for the strap attachment point_). Can be tweeked to make the print either stronger or weaker but lighter and faster to print.
+
+_**snap_fit_clearance** :_ \[_default=0.09mm_\] The clearance between two objects that would fit togeteher with difficulty. Also impact the clearance betwen threads.
+
+### 4.b - Geometrical parameters
+
 _Coming soon !_
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