Ran PID Autotune at different temps to see the differences as per @ThantiK . Solved a number of extrusion issues by better controlling the hot end temp. Does anyone have a link to understanding the results. I use them and they work … but why ?
PID Auto tune results
Start temperature 20.0 C
Mendel90 / Melzi / E3D V5
Temperature Kp Ki Kd
200 C 15.20 0.87 66.48
230 C 12.48 0.63 61.36
250 C 11.30 0.57 56.25
http://en.wikipedia.org/wiki/Control_system#PID_control this is a pretty good explanation of PID loops. Essentially you want a steady increase to the setpoint then a minimum overshoot with little to no oscillations after reaching the setpoint for a properly damped system.
Thank you, I’ll read up and see how to best pick the result for fastest response without dramatic overshoots.
They are all reasonably close to each other – I’d pick the set closer to your expected working temperatures.
@David_Forrest As I work with PLA, ABS and soon Nylon I’ll put them in Slic3r’s Printer Settings tab as specific start G-codes for each printer setup.
Do you add it in as a custom G-code for changing the PID values?
I’m interested to hear if this works out. I tuned my E3D but still get about 10C of overshoot.
@Mike_Kelly_Mike_Make Yes, that worked for me. Printer Settings > Custom G-code > Start G-code > M301 P12.48 I0.63 D61.36
using your results from http://www.lulzbot.com/?q=support/fine-tune-your-marlin-pid-settings . My hotend was swinging 20 degrees before this after switching to the E3d.
Try running the procedure again and see how repeatable the results are.
Will averaging work.
@Mohamed_Thalib_H So far the settings generated by Autotune @230 C give the tightest control … about 0.7 C swing … when printing @ 210 C Best I’ve ever seen and really helps.
@William_Frick can you share the link +Anthony Morris, or your step, just want to check if I am also using correct method.