FIFTH WEEK
ASSIGMENT: The assigment for this week was different tasks. 1.Group project: test the design rules for your printer(s) 2. Design and 3D print an object (small, few cm) that could not be made subtractively 3. 3D scan an object (and optionally print it) (extra credit: make your own scanner)
1. Group project:test design rules for your printer(s):
With Joris we print several tests to see the stress of the machine and how far can we go.This first one we just downloaded from previous years.
It scored a 100 points by printing everything perfectly, the overhang was no problem anywhere and the print looked good, even with a very high layer thickness of 0.3mm.
Here what we did is to play with the infill settings to see how much material we loose and what is the quality of the print.
Here we did a test to see what is the minimum thickness we can achive with the 3D printer.
In this experiment we wanted to see how much material a 3D printer adds, that is why we made a model that is exactly 10mm on every side. We made the ‘test cube’ in Fusion 360 and you can download the STL at the bottom of the page. 01 - the first cube has very conventional settings, an infill of 20%, a wall thickness of 0.8 and a fast printing layer height of 0.3.
02 - the second cube we printed without a wall/shell thickness, as an experiment to see what would remain.It measures:9.5/10/10.01
03 - the third cube we also gave no wall/shell thickness, but we did give it an infill of 100%, so completely solid.The result is a cube with an uneven finish, but very close to it’s original dimensions. Aesthetically this could be considered a design choice.
04 - the fourth cube we gave no infill and a very thin wall of 0.4mm.The result is a cube with good walls, but the top is dented because the printed layer has no internal support.It measures:10/10/9.5
To print this we have used the Ultimaker Original and this are the following settings:
Beacause the 3D printer is very delicated we work with special tools in case we want to put our hands inside it.
To remove the print we always use an spatula as it can be hardly stacked into the bed.
The difference between both tubes are that one we change a setting saying we want to print in the spiral mode so the nozzle will never stand up and it will be a continues movement.
Another exercice we did is to make cubes but this time completely empties in order to see how the olumns corners look like and in the minimum thickness possible.
The resoult is the following so you can see that is not very well finished as it would need some support to build more stable.It measures:10.01/10.01/10
2. Design and 3D print an object (small, few cm) that could not be made subtractively.
I designed a non substarctive volume in Rhino using a bolean operation. It is basically a spere cuted and with some holes. It is non substractive shape because this for example you can not do it with the CNC as the shape it is.
I have exported the file in STL format.
I open it in cura and define the quality of my print.
I check the layers of the print in order to see the support parts and that everything I want is there.
I did a render to imagine how it will look with material which is clay.
Thinking in the functionality part of this volume I would say is more like an sculpture in bigger scale where the user can interact with it and use it as an space.
An object inside an object.
Another exercice I did is to make an object inside an object as Neil purpose last day. I basically designed in Rhino a spere inside a sphere and the bigger one with holes. It is a non substractive shape as well as it is impossible to do it with the CNC.
I export the file in STL format again. This is the format we use to 3D print.
But this time I used a more advanced machine we have in the Lab which is the BCN. Ths machine has the property of having two different extruders so you can print with two materials.
I open cura to define the settings of the print.
And I wait for the print.
Mistakes:
I had a problem with the extruders with this machine. I tried several times to print with both but in some point the white filament was not extruding properly so I decided to print in one color and not loose time.
3. 3D scan an object (and optionally print it):
Here the most funny exercice of the week. I 3d scanned myself wit the Sense scanner. But I had to ask for help as to scann something the obect can not move and the scanner the only one who ratates.
I have installed the program where you can see the resoult. It is called System 3D and there save the scan as a STL file again.
The resoult with zoom. As you can see it is built throught triangles.
To edit the file I open it in Blender, a mesh program. There I can see in detail the triangles and play with them. But I keep them as the original and I send it to Cura.
I open the STL file in cura and I define the settings of my print.
I check the layers and the supports.
And I wait for the print.
This is the final resoult.
Mistakes:
I did not put enught material in the top and bottom so I can see the inside in some parts
Also I had to scann two times myself as the first one I missed some parts and it was too hard to edit in Blender the volume.
Files:
Tub.stl
Sculpture.stl
speres.3dm
Sculpture3D.3dm
Blanca3D.stl