Box lid doesn't fit

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?
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22 Replies
other-emerald
other-emerald2y ago
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..
Prav
Prav2y ago
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
other-emerald
other-emerald2y ago
Ok @pravvv I'm trying to fix with screw correction..I'll let you know, thanks! 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....
blacksmithforlife
did you use calipers to measure what got printed actually matches your design?
other-emerald
other-emerald2y ago
by design measures should be 126mm (w) x 90.897 (h) with calipers: 125.35mm (w) x 89.78mm (h)
other-emerald
other-emerald2y ago
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blacksmithforlife
what is your shrinkage rate?
other-emerald
other-emerald2y ago
where I can read it?
blacksmithforlife
depends on the slicer, in super slicer:
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other-emerald
other-emerald2y ago
I'm on Orca. Anyway I find it, 100%
blacksmithforlife
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
Collect3D
YouTube
A Better Way To Calibrate Your 3D Printer. Importance of Dimensiona...
Hey everyone. I want to talk about the importance of dimensional accuracy when running a 3D Print farm and selling products. I hope the information is useful to you and helps you achieve the highest level of accuracy for your products. Thanks for watching. link to calibration print: https://www.thingiverse.com/thing:5020524
other-emerald
other-emerald2y ago
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
blacksmithforlife
that's from before skew calibration correct?
other-emerald
other-emerald2y ago
before and after
blacksmithforlife
are you setting the skew in your slicer?
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other-emerald
other-emerald2y ago
no I only save config after create my profile, I see that the configs was put in the custom settings in printer.cfg
other-emerald
other-emerald2y ago
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Prav
Prav2y ago
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 :_)
other-emerald
other-emerald2y ago
ah ok thanks, I'm trying 👍
Prav
Prav2y ago
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!
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!
other-emerald
other-emerald2y ago
interesting! Problem solved...skew correction solved my print dimension and now box lid and box body fit together perfectly, thanks @pravvv @blacksmithforlife
Prav
Prav2y ago
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