Box lid doesn't fit

[sharp vigil]

Hi guys! I'm struggling with a box that I realized by myself. My box has a top and a bottom parts that fit together with screws. As you can see from Fusion360 the measures are ok and the two part fits perfectly. But after printed them I noticed that the lid doesn't fit with the box...it fits only if I turn it upside down...I tried to change print orientation, to export from Fusion360 with different orientations but nothing... it doesn't work...could you help me?

Obviously even if I posted a picture that the box has a different orientation in the slicer plate, I also tried, as I said in the previous post, to export from Fusion with that orientation too...but nothing..

[acoustic plover]

if the box is a simple rectangle, and it's misaligned like that due to different print orientation, your printer might be skewed, measure length of diagonals in your box, if they don't match your x and y axis aren't perpendicular to each other.
If that's the case, it's best to try fixing it physically by adjusting the build. small skew can be also fixed with software: https://www.klipper3d.org/Skew_Correction.html

[sharp vigil]

Ok @acoustic plover I'm trying to fix with screw correction..I'll let you know, thanks!

[sharp vigil]

I did screw corrections and created a profile with this result:

## [skew_correction vminion]
## xy_skew = -0.011364003572021884
## xz_skew = 0.0
## yz_skew = 0.0

but box lid still does not fit....

[sand juniper]

did you use calipers to measure what got printed actually matches your design?

[sharp vigil]

by design measures should be 126mm (w) x 90.897 (h)
with calipers: 125.35mm (w) x 89.78mm (h)

[sand juniper]

what is your shrinkage rate?

[sharp vigil]

where I can read it?

[sand juniper]

depends on the slicer, in super slicer:

[sharp vigil]

I'm on Orca. Anyway I find it, 100%

[sand juniper]

What I do is print the 100mm stl this guy mentions and use that to calibrate the shrinkage (after I have done flow calibration)
https://www.youtube.com/watch?v=lYmFXrmC5p0

[sharp vigil]

Ok I'll try to calibrate with this method. But can this resolve the not perfect squared box? The box can be more accurate in decimals, but why the box lid fit the box only when upside down?

As you can see from my 5th picture the gap is almost 3mm

[sand juniper]

that's from before skew calibration correct?

[sharp vigil]

before and after

[sand juniper]

are you setting the skew in your slicer?

[sharp vigil]

no I only save config after create my profile, I see that the configs was put in the custom settings in printer.cfg

[acoustic plover]

you need to add SKEW_PROFILE LOAD=vminion to the start g-code and SKEW_PROFILE REMOVE=vminion to end g-code (or start/end print macros) whichever option you like better :_)

[sharp vigil]

ah ok thanks, I'm trying 👍

[acoustic plover]

the skew you calculated is ~0.65 degrees, in the long term i'd look into adjusting your build, i don't know much about the minion, but it shouldn't be too hard to square it up.
according to prusa docs:

Over 0.25° = Severe skew compensating for the offset of 1.1 mm on 250 mm length 
Between 0.25° and 0.12° = Slight skew compensating for the offset of 0.5 mm on 250 mm length 
Under 0.12° = No need to compensate, X and Y axis are perpendicular. Congratulations! 

[sharp vigil]

interesting!

[sharp vigil]

Problem solved...skew correction solved my print dimension and now box lid and box body fit together perfectly, thanks @acoustic plover @sand juniper