Quote Originally Posted by lakester View Post
Thx..., an excellent article! I find myself wishing for that sort of diagnostic help a lot.

So if I understand it, per the article, the PID is an algorithmic function of the firmware..., and mentions it as a tuneable (in Marlin anyway). This is what I was trying to get at when I was speaking of tweaking heat cycling/hysteresis. In which case, the youtube vid that Chadd shared, would suggest that that the table expansion/contraction effects (if they're present in a particular machine) could be significantly improved with firmware tuning alone..., no hardware changes.

The article also mentions testing with PLA and blue tape as a means of isolating the problem, i.e., determining if a problem exists sans heating effects.

As mentioned you have to switch from the mechanical relay to a solid state relay to use PID, but you wouldn't have to change anything other than that.