6. 3D Scanning and printing¶
This week I worked on testing 3d printings, designing something to print and scanning.
Analysing a 3D printer.¶
For this assignment I worked in the Fabricarium. We have couple of printers such as: Dagoma Ultimate, multi-material POM,BQ witbox.
I will be focused on this one:
| TIZYX | model: EVY |
|---|---|
| dimensions | 52 x 45 x 43 cm |
| Positioning accuracy : | 0,005 mm axis Z and 0,012 mm axis X and Y |
| Auto-leveling: | BL Touch® sensor , 9 levelings |
| Printing dimensions: | 25 x 25 x 25 cm, 15,6 L volume. |
| Printing speed : | 30 à 100 mm/s |
| Nozzle : | 0,4mm |
| Material : | PLA ABS, PETG, TPU, PVA |
| Hot bed : | 25 x 25 cm – 240W - maximum température: 110°C |
The lab is full of different filaments, I chose the most popular one: PLA (renowned as the “most ecological” one… For slicing the object, Cura was the software to make the job. The printing temperature of PLA is around 200 - 220°C.
Printings settings:¶
layer height: 0,2 mm Infill: 10% Printing speed: 40 mm/s During the class, Neil gave us samples to print in order to know the printing specifications:
Test angle:¶
From 90° to 30° the angles are correctly printed but under these values we begin to see some visual imperfections. We can also note that the printer produces string between pillars, we can improve this default by increasing the retraction. But for now, we won’t change it since our goal was to test the profile given for beginners.
My teammate Sylvain Robert noticed :
Then we wanted to print the bridges test. But you have to be wary if you are using Cura, because the bridge’s setting is not automatically enabled. To enable it you have to go in the “Experimental” section and check “Enable Bridge Settings”.
Clearance:¶
The test is to define the minimum space between nuts and a main axis.
Perfect is you need printed assemblies. In all cases, all the parts are connected so supports will be somewhere. According to space, we will know the minimum space to break the support and allow the assembly floating which is 0.4mm.
all in one test¶
Checking diameter test:
| Theory | reality |
|---|---|
| 10mm | 9.77mm |
| 6mm | 5.85mm |
| 4mm | 3.89mm |
| 8mm | 7.80mm |
Checking Hole test:
diameter
| Theory | reality |
|---|---|
| 6mm | 5.89mm |
| 4mm | 3.87mm |
| 8mm | 7.95mm |
width:
| Theory | reality |
|---|---|
| 2mm | 2.05mm |
| 3mm | 2.94mm |
| 4mm | 3.97mm |
Checking length
| Theory | reality |
|---|---|
| 10mm | 10.28mm |
| 20mm | 20.27mm |
| 30mm | 30.73mm |
Checking bridging test
From 4mm to 16mm it is quiet good, after (20-25mm) the bridge has some weaknnes.
Design and 3D print an object that could not be made subtractively¶
(small, few cm3, limited by printer time)
I have made a serie of assemblies, which I turned into a jewelry. The printed materials were PLA first, and polywood.
Between my all printed parts, I add a gap of 0.4mm according to the clearance.
The presets are fine, easy to move!
I have made couple of versions:
Scanning/HORUS CICLOP¶
Recently I got a Horus Ciclop open source scanner. Arthur, which is another fabmanager of Fabricarium probe couple last semester.
open source and open hardware, the Bq ciclop is equipped from a sensor mixed by a logitech c270 HD and a ZUM BT-328 board (based on Arduino)
scanning dimensions: 25cm diameter and 20cm centimeters height. Very easy to set up and to start working.
Probing.¶
My first scan was based on the parameters of Arthur. First test, I got a Ken’s Head.
It was good, I wanted to get more accurated so I probed the scanner for the next tests.
I have followed a video, and tried to get the scanner more accurated according to darkest surfaces. I spent a lot of time moving very precisely the two laser beams. Desappointed by the results, I finally got some scans and stop my experimentations.
First shot, I thought I could do better…
New probing using black background
not really good
better to use the both laser beams
I changed to a cardboard background
I finaly got a better surface
The meshlab software gave me a closed surface of my ken’s head.
Scanning Einscann pro HD¶
This scan is more expensive but you got what you want.
The software is easy to use and you just select the handheld rapid scan and you got it.
My colleague makes a 360° ride, and the computer acquires the cloud of points.
when you lose the signal, just get back on an already scanned surface.
Hair was not scanned…