6 Sigma

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Discussion with John

John is getting bad prints.

Send some pictures and document this - there are always reasons, but I've seen transformative results in 2 cases:

Send some pictures and document this - there are always reasons, but I've seen transformative results in 2 cases:

1. Print absolute shit bubbly toad, then I dried the filament and it turned completely baby smooth perfectionu.

2. Print bubbly absolute shit and irregular, then I dropped the bed 2 mm with babystep during print, and it completely cleaned up to perfection.

I definitely understand 1, and I think I understand 2. It's subtleties that we really need to get a handle on. It could also be shit filament. Show me some pictures and send me the printer profile and I can see if I can spot the issue. Keep it all in one document so we can see all your issues in there.  I have this page - https://wiki.opensourceecology.org/wiki/3D_Printer_Log, maybe use your log for yours. It could also be fan. It could also be wrong temperature reading. We should be able to generate a checklist, where instead of guessing WTF, we go through one by one, and if every item checks, you ARE getting a perfect print. The ultimate troubleshooting thing. Once we get to this point, we actually understand the printer completely. Did you have the same prints that worked before, or is this new prints? There are quality things such as how you lay your prints out on the bed. That is all called Production Engineering. There are so many variables, that the complete verifiable results happen only if you use:

1. Identical printer

2. Identical g-code file

3. Identical printer profile. 

4. Identical environment - humidity, temperature, other vapors, wind in the environment

5. Identical filament

Once these 5 are the same, 2 results MUST be identical. If not -

1. Printer is built incorrectly

2. Printer parts are different

3. G-code file is different

4. Printer profile used is different.

5. Printer parts are defective

6. There are different ambient conditions

7. Filament is different - plastics have the ability to have many different chemical compositions/forms for the 'same' material

8. Loose belts, screws, motor burned out

9. Incorrect temperature reading on sensor.

This gets into 6 Sigma - https://en.wikipedia.org/wiki/Six_Sigma Teach your students that:) MJ