The Shop > CNC
Cetus3D 3D Printer
awemawson:
But the widths didn't fair quite so well :scratch:
There is a little blemish on each of them down one corner of the side, and I presume its where the extruder is changing level - but even trying to avoid it when measuring there is still a fair difference
awemawson:
Now remember that these were printed at approximately right angles to each other, so X axis is the length in one case, and Y axis in the other, so it's not a calibration issue.
Pretty sure it's different shrinkage in the model but I'll be interested to hear Joules's comments.
(The original Fusion360 model would have been drawn as a 100 x 50 rectangle, and then reduced to 25% so the nominal size should be 25 x 12.5 )
Henning:
All things considered I'd still say that is one helluva deal, Mr. Mawson. My original Prusa I3 MK2 does slightly better but not much and that is 3-4 times the price! Might have to look into this one myself actually... even if I need another 3D printer about as much as I need a hole in my head...
Joules:
Well the prints are pretty close to the ± 0.1mm tolerance. The width difference could be put down to a combination of mechanical things working against you in that area. Slight difference in belt pitch or a pulley slightly off centre. Possibly a little spring in the table at that point that just adds a little squeeze to each layer printed. If it is that, then it maybe a limit you are stuck with. 1cm squares 5mm tall in different locations, map them and mark them before removing from the bed for comparison. What was the Z dimension on this two parts you made, are they identical ? Bit hard to measure as the raft can contribute to Z error. Hence my calibration cubes are printed direct onto 3M tape directly on the bed.
I print about 20 or so of my calibration cubes per machine during a tune up.
The seam you are seeing is the step to the next layer, usually there is an option to have random starts for new layers to try and hide the seam. This can contribute to small blobs on the print side as the flow is stopped and started in a new position. A single seam is easier to treat as a post process and has less issue with stop start of the filament flow.
awemawson:
Joules, I don't see the error in width as a mechanical issue. For one of the Peggy's the width was X axis and for the other it was Y, and of course this is also true of the lengths, which are absolutely spot on. So both X and Y axis are producing accurate movement. :scratch:
I reckon that the shape of the model is allowing cooling stresses to affect the width far more than the length
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