@@ -28,17 +28,24 @@ We used this [test model](https://www.thingiverse.com/thing:1363023) to compare
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|First, we use this 3D printer test, TEST1, to test: angle, bridging, overhang, hole, scale, stringing, diameter, and support. ||
|"Angle
|An overhang angle is the angle the overhang sticks out from horizontal."||
|An overhang angle is the angle the overhang sticks out from horizontal."|n the test part printed by the Fortus 380, there appeared “spaghetti” like structure below the printed part when the angle from the vertical direction exceeded about 60 degrees (overhang angle less than =90-60=30).
Also, in the test part printed by the Raise 3D-pro2 there was clear roughness below the structure when the angle from the vertical direction was 70 degrees ore more (overhang angle less or equal to 20)
NOTES: I now realised that maybe we should measure the actual angle, not only discuss the effect of the angle to the structure here.|
|"Bridging
|The bridge refers to the distance between two intermediate supports of a structure. Although horizontal spans are discouraged, certain geometries can be printed."||
|The bridge refers to the distance between two intermediate supports of a structure. Although horizontal spans are discouraged, certain geometries can be printed."|As mentioned at the angle section, the test piece printed by the Fortus showed problems when the overhang angle (the angle the overhang sticks out from horizontal direction) was less or equal to 30 degrees. Also in the test part printed by the Raise 3D-pro2 there was clear roughness below the structure when the overhang angle was less or equal to 20|
|"Overhang
|An overhang is a part of the model that sticks out horizontally parallel to the build platform. This can cause the layers to lose their structure when printed without support.
|"||
|Hole||
|"|In the test piece printed by the Fortus 380, there was problems with the bridged structures (for all distances? - let’s check). Otherwise the test pieces printed by the other printers seemed ok.|
|Hole|The holes appeared to be printed reasonably well (judging from visual inspection) on all the other printers, except the Fortus 380c, where the hole shape deviated from the designed circular shape|
|Scale||
|"Stringing
|""Stringing"" is caused when small strings of plastic are left behind on a 3D printed model (also called ""oozing,"" ""whisky,"" or ""hairy"" prints). Plastic usually oozes from the nozzle while the |extruder is moving to a new position."||
|Diameter||
|""Stringing"" is caused when small strings of plastic are left behind on a 3D printed model (also called ""oozing,"" ""whisky,"" or ""hairy"" prints). Plastic usually oozes from the nozzle while the |extruder is moving to a new position."|As mentioned in the Angle and Overhang sections, the Fortus 380 had lot of problems with stringing, when the overhang angle was less or equal to 30 degrees. Also Ender 3-pro had little stringing. Formlabs 2, Raise 3D produced pretty good and smooth result with no problems with stringing.|
|Diameter|Measured diameters: We measured two outer diameters from the test print, larger and smaller.
Raise 3D: 8mm, 6mm
Formlabs: 8mm, 6mm,
Ender 3D pro2: 7.5 mm, 6.5 mm
Fortus 8mm, 6.1mmm
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|Then we test wall thickness, again without support, using this file, TEST2.||
|"Wall Thickness
|Supported walls are those that are connected to other walls on two or more sides."||
