Christophe wrote:Indeed it is not a "perfect" cube I had put a few passes of smooth (smoothing) during the modeling. The angles are therefore not sharp and the walls slightly concave (or convex it depends on how you look ) ... Well a photo is worth a thousand words ... the bottom is at the bottom.
Part printed in 90 mm / s and layers of 0.25 mm.
The convexity of the vertical walls is much more marked in real life than on the computer model. We also notice an asymmetry: it is more marked on the left than on the right.
The computer model, even smoothed, was indeed 80x80x80
Also notice all these m ** hair, especially on the horizontal walls (and I have already deleted the biggest ...) .. The PETG is really a pain to print (or it's my spool which is crap ?? It's amazon basics ...) I think that this will be my 1st and last PETG reel ... I nevertheless followed the tutorials and advice that can be found on the net about PETG. Maybe I am printing a little too fast? The maximum capacity of the machine is 120 mm / s. Not a big deal, the room is functional, ugly but functional!
In metallic 3D printing, the "deposit" speed is rarely at its maximum to limit the problems of surface condition, metallurgical problems and deformations.
To prevent the part "collapsing" under its own weight, they print at the same time as the part, "reinforcements" at strategic points.
These reinforcements are printed with weak spots so that they are easy to remove / break without adding too much finishing. These reinforcements often have the shape of a somewhat tight "grid" in particular to save material. (I have no photos )
The deformations (puff dimension of several mm) can come from the Numerical Control in particular when it is controlled in open loop.
If there is a hard point for example on an axis, the dimension is not reached without telling the NC ....... which continues as if nothing had happened.