Does heatbed thermister size matter?

I see on the bay two thermisters from the same seller that handle -40 to +288C and they indicate its table is already in the marlin firmware. The only difference is one is .8mm and one is 1.25mm. I have a RepRap heatbead MK2. Does it matter which size I get?

Thanks
Chris

In general, a larger thermal mass reacts slower. So, in general, the dynamic response of the larger thermistor will be slower than that of the smaller.

What does that mean? Well, quite simply, and presuming the same quality of workmanship during installation, the larger thermistor will probably result in a slightly larger error band in the control loop, due to it's larger thermal mass...In general..

What is the drawback? For items of this size, probably not much. (@ .8 ans 1.25mm, we're not comparing the durability of apples and oranges) However, technically, smaller thermistors are (in general) more subject to mechanical damage.

Edited 1 time(s). Last edit at 01/02/2013 04:18PM by xiando.