Dimensional accuracy in Z

[JohnInOttawa 104]

I know a lot has been said about dimensional accuracy already, the solutions seem to vary somewhat by printer.  Here's my issue:

I am upgrading my UMO to TMC2100.  Just before I swap out the drivers, I want to establish a baseline, in case something goes wrong, I at least have a reference.

 

I'm printing a 20x20x20mm cube.  Dimensions without any adjustment are 19.78 x 19.80 x 19.79.  Small in all dimensions.  0.3 nozzle, 0.2 layer height, 0.25 line width, adjusted for print quality with this filament (eSun PLA), so I would rather not tweak that further.  I can adjust horizontal expansion, but I am still short in Z.

 

My next thought will be to print a cube with vertical and lateral holes through it, but I thought I should dial this in first.

 

Thanks in advance!

 

John

[JohnInOttawa 104]

Hmmm...  Can ask this question a different way?

 

What accuracy SHOULD I expect from a UMO, 0.3 nozzle running with the GT2 belt conversion?

 

Thanks!

 

John