Exercise 217

Unrolling lofted surfaces & Preparing a watertight model for 3D printing

There is content on this page that is restricted to members. You must login to view this premium content.
If you are not yet a member, click here to learn about becoming a member.

IMPORTANT NOTE:  While it is not required, if you wish to practice generating gcode for 3D printing, you will need to download and install Cura by Utilimaker for this exercise from https://ultimaker.com/software/ultimaker-cura


In this exercise, you will work to make unrolled surfaces that when cut out will create a physical model of your skyscraper. If you can, please try to work with the skyscraper you created on Wednesday. If you find the tower too difficult, you may break it into parts or redesign/simplify your tower.  You will also learn how to create a watertight model for 3D printing and export a .obj file.

Part 1:

  • Go over your model, try to make as few surfaces as you can (this will simplify the unroll). Use the “join” command when possible to make polysurfaces.
  • Use the unrollsrf command (Rhino 5.22 [Unrollsrf]) making sure to turn the labels “on” as well as explode to “yes.”
  • In the top view, arrange your unrolled surfaces with numbered sides matching each other. Try to combine sides where possible to create a foldable cutout of your skyscraper.
  • Use the Curve>Curve From Object>Duplicate Border (dupborder) to make laser-cut lines for your shapes. Use the Offset command to create “glue tabs” to put your shape together. Remember to make cut lines red and engrave lines blue.
    • Note: You will not actually cut out this model, but the design here is that you could cut it out if it was assigned. Take some time to really learn this skill as you will use it in future classes (Archi 221 for example).
  • Make sure to include the top and the bottom of your skyscraper as this will help you to create your final shape.

Part 2: (Watertight model)