PID vs Bang-Bang Temperature Control

While configuring my new DUET 3 Mini 5+ control board that I put into my broken Prusa Mk2.5, I noticed weird surface artefacts that did not come from a wobbly z-axis! Let me show you how I found out that the heated bed was the problem and how I fixed it!

Website article: https://www.cnckitchen.com/blog/bang-...

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🛒 Equipment used in this video:
DUET 3 Mini 5+: https://e3d-online.com/products/duet-...

🖨 Printed models:
3D Benchy: https://www.thingiverse.com/thing:763622
Lumpy Bumpy Vase: https://www.prusaprinters.org/prints/...
Gayer-Anderson Cat: https://www.myminifactory.com/object/...

📖 Further Links:
Prusaprinters Blog Entry: https://blog.prusaprinters.org/dev-di...
Marlin PID Autotune: https://marlinfw.org/docs/gcode/M303....
DUET PID tuning: https://duet3d.dozuki.com/Wiki/Tuning...
Choosing and connecting a bed heater: https://duet3d.dozuki.com/Wiki/Choosi...

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How to get rid of blobs:    • (How) I finally got rid of these blobs!  

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Chapters
00:00 Introduction
00:55 Quality Problems
02:53 Bang-Bang Control
03:50 Thermal bed deformation
04:43 Z-Wobble or a bad bed?
06:43 Surface Marks despite PID
08:01 Bang-Bang or PID?
09:25 Prusa bed & DUET

#3Dprinting #duet #tips