Cura 5.2 Cancel round value to get accuracy

[bcarmezini 0]

I need parts with several different measurements, these measurements are not multiples of the nozzle diameter.
For example, I have a 5mm square, Cura makes it 4.8mm. (nozzle 0,4mm)
Where do I configure Cura to keep only the measurement of the part?

[gr5 2,095]

If you have a 5mm square and your outer wall is 0.4mm (not nozzle size - this is the outer wall line width) then Cura will have your printer print a .4mm line as the outer wall and the movement of the gantry - the XY movement of the nozzle will cover 4.6mm (5.0mm - 0.4mm).  The 0.4mm removed is .2mm on each side.  In other words it will trace out a square that is .2mm moved inward from the edge as the radius of the "line width"/nozzle is 0.2mm.

 

Anyway my point is cura does the math assuming the printer is perfect.

 

Having said all that - it looks like you have an S5 so if you want accuracy - if you want dimensional accuracy - you should be using the "engineering" profiles.  Cura has a few engineering profiles for most materials and most printcore sizes.  The visual quality is worse for these profiles but the dimensional accuracy is quite a bit better.  Try it.

 

In other words the part might look a little worse but the micrometer calipers will be happier.

 

If that's not enough accuracy for you then you probably have to alter your model by the amount of error.  It's sad to say it but that's the best way to get the next level of accuracy after engineering mode.  And realize that all other technologies (like injection molding) require someone to tweak the cad models so that the final printed part meets the design goals.