Day 6: (Mon Sep 20, Week 4) Introduction to 3D Printing

Notes for 2021-09-20.

Notes from Day 5

Due to some limits on laser cutter access this past Friday, anyone who needs extra time can turn in the assignment Wednesday, and we’ll do our in-class testing then.

New Assignments

  1. New assignment, due in a week: Exercise: Marble Fidget Toy.

Agenda

  1. Discussion of the next assignment

  2. Brief introduction to the DC gearmotor

    ../_images/dc-gearmotor-25mm.png

  3. Introduction to 3D printing

    • additive vs subtractive manufacturing

    • many commercially available processes

    • FDM process (fused-deposition modeling, aka fused filament fabrication)

    • IDeATe Stratasys “Continuous Build 3D” machine

    • time and money costs

    • process and machine limitations

  4. Cura demo to show general principles

    • STL files

    • slicing

    • infill, support

  5. SolidWorks 3D design technique

    • reference planes

    • walkthrough of the fidget-2 sample

      • mid-plane extrusion

      • sweeps

    • walkthrough of the fidget-3 sample

    • comments on 3D sketches

  6. Stratasys 3D printer and workflow

    https://resources.ideate.cmu.edu/wp-content/uploads/2019/03/20190225_162938-e1551455078272-169x300.jpg

    • six printers in parallel, continuous printing onto mylar build sheet (consumable)

    • staff approve each print, may refer some to instructor

    • course parts should have comment ‘please charge to 16-223’

    • post-printing chemical bath to remove support

    • design checking: overlap, mass properties, clearances, assembly

    • STL export

    • Skylab interface

  7. in-class sketching and CAD experimentation

Videos