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PID vs Bang-Bang Temperature Control

CNC Kitchen

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Published on Mar 27, 2021
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-bang-or-pid-bed-temperature-control

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

πŸ–¨ Printed models:
3D Benchy: https://www.thingiverse.com/thing:763622
Lumpy Bumpy Vase: https://www.prusaprinters.org/prints/16170-lumpy-bumpy-vase
Gayer-Anderson Cat: https://www.myminifactory.com/object/3d-print-gayer-anderson-cat-at-the-british-museum-london-4010

πŸ“– Further Links:
Prusaprinters Blog Entry: https://blog.prusaprinters.org/dev-diary-2-how-we-made-the-heatbed-silent_30946/
Marlin PID Autotune: https://marlinfw.org/docs/gcode/M303.html
DUET PID tuning: https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control
Choosing and connecting a bed heater: https://duet3d.dozuki.com/Wiki/Choosing_a_bed_heater

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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
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