Maya: 3D Printing Rings

smallarrows.GIF

Select the Modeling section of Maya,  choose from upper left, status line.

Use this chart to size the ring
Right Mouse over image, select Save Picture as, save to your project
Print out the chart 159.7 pixels per inch in photoshop
Cut out the ring size measure to measure your finger.



Add the chart to an image plane to match the size
Select Create->Free Image Plane
Use the Attribute Editor
    Select Image Name, add the ring chart
    Bring down the Color Gain a bit darker
Use the Channel Box
     Choose the image plane, Rotate X -90 degrees
Each grid unit = 1 CM
     Choose the image plane, Scale X,Y,Z 1.599

ring_size



Input Type, Relative Transformations
Draw a couple straight curves to use as guides.

relative_transform
Switch the selection button to Relative transformation in the Input Type box, on the status line, way over on the top right side of the screen. (Sometimes this is hidden if your screen is small, click on the show/hide buttons to expand hidden sections.) When you enter a value in the box for a transformation, such as scale, rotate, or move, the object or componentent will transform will move relative to its position.



Create->Curve Tools->CV Curve Tool->boxicon.gif
     Select Curve degree:  1 Linear
Click the first point in the top view at the edge of your ring
Input the second point in the Input Type box X: check your ring size, mine is a size 9 so I will input 1.9 cm (19mm).

Use this curve as a guide.

In addition, make a .1 cm guide, Shapeways does not let you print metal objects thinner than .1 cm.



Select Create->NURBS Primitives->Circle->boxicon.gif
     Normal axis: Y
     Radius input half your ring size (my ring size 9 - 19 mm, or 1.9 cm / 2 = .95 cm)
     Number of sections 80

If you need to know the circumference use Pi * diameter (for my size 9: 3.14159 * 1.9 cm = 5.969021



Use any tools to model a ring.



Inspect your model for holes or flipped faces.

Use Mesh->Fill Hole to fill holes

Use Edit Mesh->Merge to clean up your mesh, careful the tolerance does not delete the wrong points.


Check the outer diameter of you ring so you can compare it to the Shapeways scale.
Select your ring.
Choose Display->Polygon->Vertices
Use Create->Measure Tools->Distance Tool
Use v point snap and shift to constrain to measure from the outer edge of the ring
shapeways_measure_ring


Exporting your model

Select your model.
Choose File->Export Selection...
     File type: DAE_FBX expor
t
(Do not use OBJ or STL_DCE these formats do not retain the scale information.)

Uploading to Shapeways
Go to www.shapeways.com and select upload
Make an account, make sure you apply for the 15% student discount.
Select and upload your DAE file
In the Upload dialogue box, make sure that Model Units: millimeters is checked
3DP_06_Shapeways1

Shapeways offers a preview where you should inspect your model again.
Check the scale and look for missing/flipped faces.

shapeways_ring
You are ready to print!