Today I am going to make the Overwatch Mei's ENDOTHERMIC BLASTER
Let's examine the shape
The Shape is not casually design
Many of them is real
See the bottom write liquid nitrogen in Chinese
the liquid nitrogen come out from the barrel
The gray part beside is the flowmeter
It shows how much the flow is
You can see the flow come out from the gun
and freeze the enemy
Let's see the real liquid nitrogen tank
The gas go through the valve and reduced pressure
Come out from the flowmeter
The higher the steel ball ,the faster the flow is
However the liquid nitrogen tank is too big
and it is high pressure
I need something safer
Compress gas or Co2 is an option
Both can produce mist
But gas will explode .too danger
As a result I find the solution
Water
This ultrasonic device
include the electric circuit
produce 1.7MHz frequency vibration
transform the water in small shape
mist
is a safe and easy way
However it need to contact water one side
insulation on the other side
so I screw it outside
I use 3 9V battery. 27V total
There is a wire detecting whether there is water or not
if no water left it will auto turn off .avoiding overheat
When it contact the water
ultrasonic turn on
After this is all done
I start to design the gun
Mei's gun is more difficult than tracer's gun
tracer's gun is flat
Mei's gun contain circle and column
Neither plate
After I finish the shape
I remove the part for installing MB
and the fan
Since my 3D printer can only print single color one time
I separate it by color
and drill screw holes
I will introduce 3D printing
What is 3D print?
You can see this paste 物
stacking layer by layer
Just like the paper of book
3D Printing is also known as Additive Manufacturing
Stacking layer by layer
My 3D printer is Fused deposition modeling (FDM)
It heat the material to liquid
and extrudes from the nozzle. stacking to form the 3D structure
In this part, I will introduce the process to print the parts
First you need to transform the 3D file to STL format
Import it in slicing software
I use CURA
You can set layer height, infill rate and temperature
Now we turn to layer mode
The red line is OUTER WALL
The green line is INTER WALL
The yellow line is infill
Dark blue shows where the nozzle moves
light blue line is support
The support will automatically generated to prevent material fall
It's not the origin in the model
You need to remove support after finish printing
After checking the layers, save the code to SD card
Insert in the printer
Using glue stick on the print bed can improve the material sticking
The nozzle heat is up to 200C
Stay away to prevent hurt
I need to have 2 color on 1 parts
so I use a little trick
I pause in the middle of printing to change the filament
so I can have 2 color on 1 parts
After finish printing , the part is sticking on the bed
Use shovel if needed
be careful! Never put your finger in front of the shove
Sometimes the part can easily be remove by hand
then we can print the rest parts
Post-processing
The support is not what we want
We need to remove it first
Then examine the quality
Larger support can easily be remove by hand
smaller one needs tool
By the way I need to saw the gun barrel
because the size is too small
and I find I forgot to make some screw holes
I use drilling machine to fix it
It's easy
No need to adjust RPM
Just lock the drill
and turn on
The last step is to assemble
wire,screw , etc
The blue LED lights
Fan runs. and then we can continue
After testing
I find out the mist is too heavy for the fan
for the fan.
The fan is too weak
I try to make other water tank in the barrel
Now the mist can come out
However I think it can do better if I have bigger fan
I hope I can make Winston or lucio's gun next time
or others
Hope you like it and share it
Give us some opinion
Thanks for watching
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