JIN`s Fab Academy 2018:
How to make almost everything

week6:3D Scanning and Printing

Group Assignments

The 3D printer we have at Fablab Seoul is called 'Creatable D3'. D3 is made by a company called 'Ateamvenctures'.
This company is a korea startup company. D3 is FDM, bowden and delta type. It's a $ 1,000 low-end 3D printer.
The output size is 250 (dia) x200H mm. Slicing software uses CURA. The storage medium should use SD card.
Possible materials are PLA, ABS, Magnetic, PETG and so on. The printer's weight is 10kg lighter and the design is very beautiful.
The price is low but the output is good and the resolution is high. It is good enough to be used for educational purposes.
However, it has a drawback that it is weak in durability. There is a risk of breaking because the bed is glassy.

It sells at a very low price. You can try CURA redeveloped with D3.

Durability is weak. Because the bed is glass, the bottom of the printout is handled well, but there is a risk of breaking.

-No suppot bridge-

I checked the D3 to see how well the bridge worked without supporters.
Initially, the bridge length was 30mm and the output was 40mm, 50mm, 60mm.
The D3 had a good output of 60mm. The output seems to be very good.
However, the deflection is seen in the middle part from 50mm. 30 ~ 40mm output is neat.

As for the photograph, 50,60mm shows some sagging phenomenon. 30mm came out the most clean.

1. learing 3D scanning

3D scanning is a machine that makes the appearance data of an existing object three-dimensional.
It is usually used to extract appearance data of an existing object.
There are many optical scanners that can be retrofitted, but there are only home scanners at Fablab Seoul.
I will use xyzprinting's handy 3D snanner to determine the distance and light intensity of the scanning.

I did a scan with my classmate Minsu. Because I can not scan myself alone.
I determined the distance at which I could scan well from 300 mm to 400 mm.
So I kept the distance to 300 millimeters when I scanned Minsu.
What I learned from doing scanning is that it is very important to keep distance.
It is neither near nor far. The distance at the first scan should be maintained.
And the degree of light is also important. The light should not be too low and not too reflective.
After about four scans, they made satisfactory scans of each other.
I didn't realize it was so hard to scan people.

Distance control is important for handy scanning. It is neither near nor far.

When measured, 30 to 40 centimeters was a good distance. They scanned the head carefully because it was difficult to scan.

It looks like I'm being scanned.

After scanning, I converted to STL and put it into CURA.It seems to have come out well.

And I learned more about 3D scanners from xyz printing.
There is a video where youtube tested the scanner, which is good.
It compares xyz printing software with 'the 3D system's Sense software.'
You can see a little clearer in Sense.

- using meshmixer -

I used the 'Mesh mixer' to modify the scanning file.
Mesh mixer is a good software that can be modified in a variety of ways.
You can use it a lot to make 3D scanning and programming.
I modified my scanning file. It has become a little cleaner.

It is an image that Minsu imports as a meshmixer with a file that has 3D scanned me.

In meshmixer I modified the bumpy part with sculpt. And I called it from CURA.

And I tried the output. Clearly modeling with meshmixer has been cleaner.

2. learing parametric Design and 3D printing

I wanted to learn parametric design properly. So I searched the internet and found a good resource.
Hook-like modeling has various parametric values for width, depth, height, patten, offse etc.
'Here you go to the link', youtube video, you can practice while watching. Download the file below and you will be able to practice.
I made my final project, the watch line, through this.

I made 9 squares and in parametric wire width, wire Depth. Set wire Height, clearance, crossbarwidth, and crossbarDepth. Then enter parametic for each length as a dimension.

And so on, extrude and enter parametic for each part. Here tip must be set to new body in operation rather than join.

You can also set parametic via move. I set crossbarHeight here. Tip also makes the settings and combines the pieces with the combine.

Set and apply pattern parametric.

And I tried 3d printing through cura.

However, when I thinned it too thinly, I dropped it and it was shattered.

So I modified the thickness to parametic easily and printed out again.

It is the result. This time, we have a robust parametic design output.

Lastly, I made the clockwork line by using the parametic design. This image is worn in my hands.

3. learing joint 3D printing

I was worried about some things to do joint design. One of them was to make a temporary support.
When making supporter in cura, it is inconvenient to remove because it is produced in a large area.
So I made support for the joint part in fusion360. I saw Fabbot in my role as support. Fabbot is a joint robot I made.
It is difficult to make legs so that the neck and arm can move.
However, when the throat went in the middle of printing, the output failed and the right arm worked well, but the left arm did not work well.
So I solved this part by making the suppot I used before. And I made Fabman.
It is not a joint robot, but I made it because it is cute. Download a lot

I made the joint part myself.

I made the suppot thinner to act as a support. I tested it after printing and it worked well.

I made body and head separately to make Fabbot.

And body, head and arms were assemble at fusion360.

But the support on the neck was so weak that my head went back. The output then failed.

So I made one more support to get my neck back in the solution. And Fabbot is done !! Wow!!

My friend is FabMan!!! Download GOGOGO!!!

Fabbot by jinhyeok on Sketchfab

Fab Man by jinhyeok on Sketchfab

4. learing press fit 3D printing

I decided to look at the D3 Press fit. 0.2, 0.4, 0.6, and 0.8 mm. As a result, 0.4mm is the D3 press fit.
And I decided to fix the broken shoe box at home. The shoelace collapsed as the joint that sustained the shoebox broke. So I created a joint through modeling.
A press fit of 0.4 mm was applied to ensure that the round bar would penetrate well. But I made one mistake here.
It changes the press fit in a flattened circle. So I revised it again.
The press fit of the circle climbing from the x, y axis to the z axis was 0.4 mm, and the circle moving up the y axis in the x and z axes was modified to 0.6 mm more press fit.
The result was successful !!! You should consider the limitations of the direction and support of the 3D printer.

We found that the press fit of D3 was 0.4mm. And a shoebox in the house.

The reason the shoe box is broken is due to the weak joint. So I made a stronger joint with solidworks.

The press fit that rises in the x and y axes along the z axis is 0.4 mm, while the y axis that rises in the x and z axes has a press fit of 0.6 mm. Note please

And I applied at home. Broken shoe repair completed !!! It is one of the advantages of 3D printing. Repair is possible !!

-This week Notification-

It was surprising that 3D scanning could bring in an STL of the appearance of existing objects.
However, accuracy of handy scanner was very poor. Next, I would like to use an optical scanner that can reverse the process.
3D printing was great because it allowed me to design the exterior of the machine and complement the hardware damage.
It is useful because 3D printing allows the appearance of prototypes.
Although its mechanical tolerances and quality are still low, it is a technology that has infinite potential for development.

-Download File-

bridge 20~40mm
fab bot.f3d
fab bot.stl
fab man.stl
parametric design.f3d
scanning.zip
shose adapter.SLDPRT
shose adapter.STL
shose adapter.STL
circle press fit 0.4.stl

Fablab Seoul

JIN`s Fab Academy 2018: How to make almost everything