Cal cube size problems

[danluc 0]

So when i print the 20mm cal cube its comes out at about 19.6 ish not 20. I am using Cura and I do calibrate the filament extruder as part of the setup and its very precise.

I am curious where that error comes from? Any ideas?

I thought it has to do with the steppers or their drivers.

[blecheimer 9]

I guess it is the shrinkage of the PLA when cooling down.

The sides of my cube are 19.7mm.

[danluc 0]

I would assume that this would not be resolved by a heated bed would it? Especially on taller parts.

I am building another 3D printer out of profiles and currently deciding to salvage ultimaker parts or not. The arduino board is easy enough but the extruder I'm hating and would like a MakerBot style extruder.