Select the Modeling section of Maya, choose from upper left, status line.
Use this chart to size your finger for the ring.
Add the chart to an image plane to match the size
Select Create->Free Image Plane
Use the Attribute Editor (Ctrl a)
Select Image Name, add the ring chart
Bring down the Color Gain a bit darker
Use the Channel Box
Hit the arrow up button to see the transformation options.
Choose the image plane, Rotate X -90 degrees
(Each grid unit = 1 CM)
Choose the image plane, Scale X,Y,Z 2.61, 2.61, 2.61
Input Type, Relative Transformations
Draw a couple straight curves to use as guides.
Switch the selection button to Relative transformation in the Input Type box, on the status line, on the top middle 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 component will transform will move relative to its position.
Create->Curve Tools->CV Curve Tool->
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.
Use the curve as a guide.
In addition, make a .1 cm guide, Shapeways does not let you print metal objects thinner than .1 cm. The height of the ring will need to be 2 cm.
Select Create->NURBS Primitives->Circle->
Normal axis: Y
Radius input half your ring size (my ring size 9: 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.
Bend your Ring
If you start with a flat shape, use Deform->Nonlinear->Bend
Rotate the bend deformer to match the intended bend
Use the Channel Editor to modify the Curvature of the Bend
Check the outer diameter of you ring so you can compare it to the Shapeways scale.
Select your ring.
Use Create->Measure Tools->Distance Tool
Use v point snap and shift to constrain to measure from the outer edge of the ring
Prepare your model
Edit->Duplicate, hide original
Edit Mesh->Merge with a very small number, .00001
Mesh->Cleanup-> with Lamina Faces
Export your model
File->Save Scene As your scene, the software can crash doing this.
Select your model.
Choose File->Export Selection...
File type: DAE_FBX export
If DAE_FBX does not work:
Select your model
Choose Modify->Freeze Transformations
Scale your model 10x larger XYZ
Name your file Your name_Xsize_mm_material
The outer X dimension will be between 20-30mm, 2-3cm
Place this file in the drop/assign2 folder on the class server
Uploading to Shapeways to test
Go to www.shapeways.com and select upload
Make an account, make sure you apply for the 15% student discount.
Select this menu and upload your DAE file or OBJ, choose your material.
Shapeways offers a preview where you should inspect your model again.
Check the scale and look for missing/flipped faces.
You are ready to print!