(listed in alphabetical order, please scroll down to see explanations and examples of each)
To learn more about 3D filaments and their properties, please visit
Bridging - is where you print several layers of filament over a gap space in your 3D Print. (see example picture at left) Done properly, there will be no sag or droop in your bridge, however without the proper supports or too far extension of bridged material, this is not guaranteed. (look closely at top 2 bridges in example picture - they both have some sag in the middle. Another common issue with bridging is the appearance of threads of thin pieces of fiber stringing through the gap under the bridge. This is normal and usually cleaned up in the post print process before it ever gets to the client.
3D prints can fail for any number of reasons. The most common deal with temperature settings; either the extruder (where the filament comes out of the 3d printer) or the bed (what the extruder prints on) is too hot or not hot enough.
Any of these four failures can cause a print not to stick to the bed which can cause the print to fail by by not sticking only in certain spots to where it doesn't print correctly and looks uneven. Another result is called peeling, where one corner curls upwards off of the bed and while the print fully prints, it looks slightly off.
A more serious failure is where the entire print doesn't stick and normally becomes a jumbled mess as it is dragged along the bed by the extruder and gets mangled with another part of the print.
Additionally the print can shift during the printing process; when it happens early in the print process it generally results in what is called a full print shift. This is where the print no longer sticks to the bed during the printing process and the entire print gets moved by accident by the extruder as it moves around during the printing job. The 3D printer has no way of knowing that the print has shifted and continues to print the next layers in the original spot.
Line Shift is a more serious failure during the printing process, because unlike the full print shift (if caught early enough you can stop the print and restart), a line shift occurs in the middle of the print and you have to start the entire print over from the beginning. Depending on the print and how significant the line shift is, it may be hardly noticeable or it can be very obvious.
Notice how the nose is out of alignment between the bottom 1/2 and the top 1/2.
This is the same print as the front view, but notice how less noticeable the line shift is. Its about 2/3 of the way up the ear. and not that detectable on the ear, but is noticeable on the head behind the ear.
What sits inside a 3D print’s outer shells is called infill, and it can be adjusted with respect to density – 0% is hollow while 100% is solid – and different printing patterns.
To find out more information about infill patterns, infill percentage, and examples click the link below.
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