PID Autotune

[Suggy]

Evening all. Been reading about hot end’s heating up and fine tuning the PID settings by a user on another forum that goes by the name of AKeric, here’s what he said

PID Autotune:

While my extruder has been heating up fine, I noticed that as it approaches the target temp (say, 200c) it really slows down for the last few degrees, and takes a long time getting to the final temp. I remember that when I switched my Replicator 2x to Sailfish firmware, the extruders stopped heating up correctly, and talking on the forums they told me I needed to update my PID settings.

PID stands for “proportional-integral-derivative“, something I did not learn about in math class. But in a nutshell it’s a way via the maths to reach a target value smoothly and quickly, without banging/oscillating all over the place. And luckily, Marlin comes with a PID autotune feature you can run as G-Code directly from S3D (or any software that can issue G-Code:

M303 E0 S200 C8Fire that off when you extruder is cold, and a few minutes later it’ll spit out 3 values for you enter back into Marlin’s Configuration.h file. As it turned out, mine are:

#define DEFAULT_Kp 46.15
#define DEFAULT_Ki 5.10
#define DEFAULT_Kd 104.32I never timed the nozzle warmup before, my E3d-V6 Volcano now heats up from cold to 200c in 2min 10 seconds: Not too bad.

Does anyone know if this can be done on the CTC machine running sailfish?

If so how would I go about doing this?

Using Simplify3D and have RepG installed aswell

[adamcooks]

There is no PID autotune in sailfish. You can change all the paramaters manualy through the onboard preferences in RepG. There were some changes recommended for rep2x users as there was some fan wash. AKeric and I share inspiration for our printers, mine is the triple leadscrew varient, any advice you glean from his blogs is worth noting.

One a side note, I also use a volcano nozzle on my big bot, running a flashforge mightyboard, I do get pretty consistant temps.

[Suggy]

Ok thanks, that’s what I thought but weren’t shore. Bot’s looking good. Been thinking about building a large bot myself (funds a little tight at this time of the year) what’s the biggest HBP available? And I could do with a local supplier to me (UK Leeds, Yorkshire) as I like to see before I buy and I like the face to face deals as information gained by chatting most often come in handy.