Dang, how did you do that so well without CAD? Slicer magic?
I hope the answer is a ruler. 
Slicer magic!
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I am glad it was not a ruler, I would have felt so lazy!!!
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My calipers don’t get that big…
Primo Core Test.zip (6.5 KB)
What do you think. Print vase mode, no tops or bottoms. That allows you to slap a tape measure through the middle and check the diagonals. They should be equal and
208.87mm x 161.25mm
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I print most of my calibration cubes in vase mode. Makes good small screw holders when I taking things apart.
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I’m already printing a test vase. Has to have a bottom. No way it will stick without that.
Brim? Hard to measure accurately on the outside of it
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Diagonals on the bottom.
I think this is actually almost a necessity for a self printed Core. No amount of adjustments can compensate for a crooked print. And we all know almost zero people have ever checked anything beyond “does my axis move 10mm”.
I have a feeling we are going to discover that a majority of all printers have a wonky Perpendicularity on one or more axis.
It has rounded corners so there are no bulges or ringing from acceleration.
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Fancy! I just had prusaslicer make me a box…
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My printer’s datasheet says 18x18x18cm. Should be fine. 
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Cant you just print a regular core with 0% infill?
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I don’t want to know 
my primo is working great so far. If I don’t lift the feet with a tool length measure to often I’ll be ok have done this 3 time in the last week and you cant get a flat bottom with 1 or 2 legs a different length
I don’t think so. Too many bridges with the bolt holes.
Doing better than I thought it would!
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Okay, I think with the tall flat walls that we need some infill.
The front is bowing in as well.
Actually, all four sides are bowing in.
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I restarted that print and about two hours in it failed again with a shift in the y axis. Shut it down and started looking for issues, turns out the heat sink on the driver for the y axis was barely attached. My guess is the driver overheated and shut down. Now to wait on some thermal paste.
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