Core One: Belt tuning temperature dependency
After keeping belts in tune at room temperature (as most people will probably do) I repeated belt tuning immediately after a 12h print at 55°C chamber temperature where the printer was thoroughly "heat soaked".
To my surprise, I had to loosen screws 3/8 turns, which is a significant change. So it seems the metal is expanding more with temperature than the belts.
My own conclusion (printing mostly ASA at 55 deg) is to aim for the low end of the pitch range at room temperature in the future.
RE: Core One: Belt tuning temperature dependency
Kevlar, which I understand to be the reinforcing material in the belts, actually has a negative coefficient of thermal expansion. Hence the belts will contract (slightly) while the metal frame expands.
RE: Core One: Belt tuning temperature dependency
I noticed that aswell, tried for fun at 7-8deg which is the workshop idle temp during winter, got very high values but didnt change anything based on that, will only do it at room temp.