3D scanning and printing
This assigment has composed in three sections:
- Group project: Test the design rules for your printer
- Design and 3D print an object that could not be made subtractively.
- 3D scan an object
Group project
We test the 3d printer BNC, Makerbot and Felix . To achieve testing we received a class how
how to use 3D printer by the instructor.
For each machine we have selected a PLA colour
BCN 3D printer must calibrate the platform and extruder
Before starting the printing we spreaded lacquer on the
platform. The Lacquer helps to separate the
easily 3d printing finish and the platform.
Also, the Felix 1.0 has a steel platform. The picture shows how to print start
Finally, the right image has two designs which were download from thingiverse, the left part represents the FELIX 1.0 printing, right image shows 3D BCN printing. We see that BCN is better quality than FELIX 1.0. The reasons for these special feature are FELIX 1.0 is more rustic, the PLA quality and tolerances have considerable impact in 3d printing.
According to these tests, the proper tolerance for a free movement is 0.3 to 0.4mm.
3D printing
I have designed two components: a shaft and leg bones llama. The last one has the union of kneecap. These have designed in OpenSCAD. They print as an assembly together and could not be manufactured in a subtractive way because these objects able to rotate.
3D scan an object
My desire was to scan an allicator skull which has gotten few years ago. I have installed SCANN3D from Google Play store. Which is an app based on photogrammetry. The steps to generate a 3D model will detail in next paragraphs.
Open SCANN3D and login as trial user
Touch in New Model
Take a photos encircle my target
Finished taking 18 photos
Selected all images
Start the calculation for a model
Open the 3D model
3D View
Another 3D View
Final conclussions
In the next Table we show the advantes/disavantages of 3D printing and scanning. I considered only these items, but existis more than I could see.
| Tecnology | Advantages | Disavantages |
|---|---|---|
| 3d printing | Rapid prototyping | Long time to print elements |
| Every year its technology is better | Problems with filaments as jam and dirty extrusor | |
| Fail cheap | Supports not always help | |
| It allow recycling | Noise printing | |
| Personalization each design | ||
| 3D scanning | Easy to use | Not very accurate |
| Saving time in design replication | The output result is not clear | |
| Differents applications from apps to special hardware | For small thing is impossible 3D scanning | |
| Quiclky results | Not give details. |