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ENGR242 MiniMech project

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Hotend.JPG This page is part of a Principia course ENGR242: 3-D Printing Technology

Please leave comments using the discussion tab. The course runs in the Spring semester. It is not open edit.



Assignment[edit]

Mini-tensile-diagram.png
  1. Download files for the PASCO test coupon from the Open Science Framework (click on the one you want and then click "download") You only need 2 stl files (rounded and vertical) and one ini file.
    1. The .curaprofile is a slicing profile that you can start with. The provided .curaprofile contains all parameter settings for getting a good quality slice file. I have intentionally left layer thickness, print temperature, print speed, flow % blank. These are the variables you can play with. This .curaprofile is to be used for all specimens. Note: Loading the .ini file provide will REMOVE the current profile in Cura. Please save your standard default profile before loading. If you happen to lose the profile, you can reload it from an old .gcode file without trouble.
  1. Choose your optimal print settings (e.g. what you think gives you the best looking part and max strength) and then using PLA from any vendor you like print:
    1. 3X small horizontal rounded, and
    2. 3X small vertical
    • Note: Parts must conform to dimensional specifications as indicated on right to be acceptable per ASTM D628-14 Type IV.
  2. Put your specimens in a bag with your name and course labelled on/in the bag
  3. Input your variable parameters with your name to the course data spread sheet in a single line here
  4. Test your samples for tension in the Engineering Lab and record your max tensile strength (just before rupture) as well as strain (elongation) at that max strength for each of your 6 samples. Record that on the spreadsheet here as well.
  5. Post your best stress strain curve (output from the tester) on your Appropedia page as well as your analysis, revised hypotheses and conclusions

Having Trouble?[edit]

Basic inputs to start with:

  • Layer Thickness: 0.2mm
  • Temperature: 210C
  • Flow: 100%
  • Speed: 80mm/s
  • Bed Temp: N/A unless you have a heated bed then put it in the comments

Make sure the horizontal ones are printing flat and the vertical one prints on the circle (see image below).

Vert-tensile.png