Week 5: 3D Scanning and 3D printing

Group Assignments: https://fabacademy.org/2023/labs/rwanda/Group_Assignment/3D_Scanning_and_Printing.html or just click Here 

            Individual assignment:
                  - design and 3D print an object (small, few cm3, limited by printer time)
                    that could not be made subtractively
                  - 3D scan an object (and optionally print it)
              Our local instructor advised us to design something with parts that move yet still connected.
              with the idea of a yo yo, i made something that has a central part which will move, rotated.
              On the top plane, I started by sketching a circle, a 3point curve around the cicle,made it a circular partern (6).
              Then i joined two curves with another curve and made 6 circular partern of that curve.
              I made another (to be cut) circle and multiplied it by 6.          
              
             
              Then i extruded bross.
              On the front plane, drew a center line, and sketched the contour that, when revolve-cut, will extract the trail of the inside peace.
              
              

            Then i drew a similar shape with a little bit of clearance. 
            Then revolve extruded the inside.
            
            The final piece looked like this:
            I tried to add text on top of the piece as well.

            

            After exporting the stl format from solidworks, i opened the piece in creality slicer.
            
            I did open in creality slicer, because the machines in our lab is creality. Cura may have other parameters that are similar,
            However i preferred using the same model, to avoid inconsistances.
            

            I eddited some quality, infill percentages, bottom and top layer traces, to reduce the printing time.
             
            It took more than 2 hours but the print went well.
               

            The final peice came out but the letters i had put on the top did not get printed well.
            Probably because they were too small.
            

          The final piece looks like this:
           

           The video on how it is used is embedded
I have done many other prints to test differences in outcomes based on parametes
A dognut shape that is not well layed on the bed of the printer comes out with a good top but a bad bottom!
Another rotating joint

ADVANTAGES OF 3D PRINING

  1. LOW COST PROTOTYPING
  2. EASY TESTING OF Mechanical/ PHYSICAL STRUCTURES
  3. INHOUSE/ PERSONNAL FABRICATION MADE EASY
  4. CUSTOM PARTS ARE EASILY MADE

LIMITATIONS OF 3D PRINTING


  1. SMALL SIZES
  2. LONG TIME OF PRINTING
  3. SOME PARTS REQUIRE SUPPORT TO COME OUT NICELY
  4. COMPLEX MODELS ARE SOMETIMES HARD TO PRINT
Images dowm demonstrate the limitations of 3D printing
A flat surface supported by the perimeter, looks good on the top but the bottom may have issues.

3D scanning:

In my lab i have a leTMC-520 scanner

i am figuring out how to use the device, there is potential in what does.

I admit the cura sense 3d scanner is much better I had to go to the local fablab and use it for this assignment, since i have used it before.

I finally went to the lab to use the SENSE 3D scanner. First, i had to download the software from 3dsystems.com. After installation, i connected the USB of the device, then run the program. with the serial number plus activation code, i was able to use sense. I proceeded to scanning:
The front came out like: The back came out flat! the side was like: Then I opened the scan into the slicer The deigns i used in this assignment can be found here:
STL of the yoyo
Solidworks part for the yoyo
The scanned stl of my face