Printed parts are too big

Bambu Lab P1 Series
1

Hi,

I have a problem with my printer.
I have printed Voron Cube with PA12-CF using a 0.6mm hardened-steel nozzle and my problem is that:

In the X-axis dimensions are bigger at about 0.19mm (average size = 30.19mm) so it should be scaled 99.37% (average from 3 measurements - at two ends and on center (30.23mm, 30.16mm, 30.18mm)) so it should be scaled up with a scale of 99.37%.

In the Y-axis bigger at about 0.247mm (average size = 30.247) it should be scaled up with a scale of 99.18%.

In the Z-axis smaller at about 0.487mm (average size = 29.513) so it should be scaled up with a scale of 101.65%.

The same problem is with ABS printed with a 0.4mm nozzle - the differences between measurements are very similar.

I know that these materials will shrink when they will coll but why are the prints expanded/shrank not equally?

I think about trying to use XY contour compensation with a -0,2185 value average of 0,19(X-axis expansion) and 0,247 (Y-axis expansion) and scale up the Z-axis at 101.65%, but there is so much to remember when changing filaments and setting every print and those are still averages of measured sizes so not so accurate.

Is it possible to calibrate the dimensional accuracy of the printer?

2

Something to read:

1 Like
3

ok, but the layers are looking good. The print is smooth, I can`t see any linked advice, but maybe it is there.

4

In the filament profile you can set the shrinkage for a given filament. The default profile values are a general value and might not be correct for your specific type/brand/color of filament. I used this to get more accurate prints.

When testing, I did multiple prints and measured at multiple locations. I then used average measurements to adjust the shrinkage setting.
For example, using PLA which has very little shrinkage and has shrinkage set to 100%, I was printing a 200mm part and it was only 199.56mm. For this particular part that was not acceptable. I calculated that shrinkage was 99.78% and changed the shrinkage setting. My final print was 200.08mm when I stopped measuring and adjusting.