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Stl validation
 

Stl validation

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  • When opening an STL file, netfabb performs a preliminary analysis to determine if there are issues that could cause problems during 3D printing. The most common issues include holes, 'naked' edges, and triangles with invalid orientations (i.e they are inside-out).If problem(s) are found, a large, red "!" will be displayed in the lower right hand corner and (usually) a part volume will not be calculated. If you do not see the red attention warning, your file is very likely ready for 3D printing and nothing further is needed.

Stl validation Stl validation Presentation Transcript

  • STL VALIDATIONCHECKING A PART BEFORE SENDING IT TO BEPRINTED USING NETFABBBASED ON TRUE STORIES Greta D’Angelo Martí Bertran Thomas J. Howard
  • CHECKING EXPORTEDSTL FILES WITH NETFABBNot always the generated STL files are correctWe sometimes may find some errors that MUST be repairedbefore sending a file for being printedYou can download the free version (basic) here:http://www.netfabb.com/download.php 2
  • OTHER USEFULCAPABILITIES OF NETFABBWith Netfabb we can measure, scale, rotate, translate, splitand repair damaged STL filesNote: Netfabb free version has limitations e.g. You can’t savemore than 1 STL on the same file, or change de file size.More info:http://wiki.netfabb.com/Main_Page 3
  • CHECK LIST1. One file for each part2. File size3. Correct scale and overall part dimensions4. Part orientation5. Wall thickness6. Support structures needed7. STL file errors 4
  • 1. ONE FILE FOR EACHPART• Every part must be sent as a separate STL file, also if you have cut a part. 5
  • 2. FILE SIZE • STL resolution should be high enough for having a smooth surface but not more • A STL file that loads more than 3Mb may be problematic to process by the GCode generator. • If we have a too low or too high resolution, we will have to export the part again changing resolution parameters Too low OK Too high “Think also about the scale of your part, the resolution we need in order to print this example, is not the same if the arc diameter is 3cm, or 10 cm. If it was 3cm, maybe6 the left resolution is enough, but not for a 10cm arc.”
  • 3. CORRECT SCALE AND OVERALL PART DIMENSIONS “We can check the dimensions of a part using the measuring tools, this part is too7 small to be printed correctly, maybe because is wrongly scaled.”
  • 3. CORRECT SCALE AND OVERALL PART DIMENSIONS “We can scale parts using de scaling tool. In that case we‟re going to8 make this part 15 time bigger.”
  • 3. CORRECT SCALE AND OVERALL PART DIMENSIONS Dimensions after scaling9 “After the scaling, the dimensions seems good do be printed.”
  • 4. PART ORIENTATION Building platform “As how is oriented now, we well need supports to print this part, but if we10 rotate it, we won‟t.”
  • 4. PART ORIENTATION “We can rotate this part 180º in either X or Y axis.”11
  • 4. PART ORIENTATION Part after the rotation “After the rotation we can translate the part to the origin, to match the12 base of the part with the building platform.”
  • 4. PART ORIENTATION “Select “To Origin” and then “Move” to match the base of the part with the13 building platform.”
  • 4. PART ORIENTATION Part after the translation “Now the part is well oriented and scalled. We can also see the overall14 dimensions. This dimensions Must be always under 210x210x200mm.”
  • 5. CHECKING WALL THICKNESS “All the measurements are correct, the XY wall thicknesses are all over 1,2mm, and we have a Z wall thickness of 0,93mm, which is absolutely15 printable, and only in a very small area.”
  • 6. SUPPORT STRUCTURES “This part doesn‟t need supports, it only has a very tinny overhang and a16 small vertical hole, which won‟t have problems to be printed correctly.”
  • 7. STL FILE ERRORS (1) “When opening an STL file, netfabb performs a preliminary analysis to determine if there are issues that could cause problems during 3D printing. The most common issues include holes, naked edges, and triangles with invalid orientations (i.e they are inside-out). If problem(s) are found, a large, red "!" will be displayed in the lower right hand corner and (usually) a part volume will not be calculated. If you do not see the red attention warning, your17 file is very likely ready for 3D printing and nothing further is needed.”
  • 7. STL FILE ERRORS (2) “Now that we know that netfabb has found problem(s) well perform a more thorough analysis. Select the option for Standard Analysis. netfabb will work for a bit and a new layer will appear with the part now rendered in gray and defects in18 different colors (as defined under Settings>Colors>Repairs).”
  • 7. STL FILE ERRORS (3)“Nothing has changed with your original file. The information panel on the right will now include a summary of the typeand number of problems. Pay attention to the number of problems but especially take a look a little further down to seeif the surface is closed and/or some of the mesh seems to be pointing inside-out.In our case, a red No tells us that our surface is not closed. 3D printers dont like unclosed (non-manifold, non-watertight) surfaces and will often not print or will print additional artifacts when they are encountered. They are usuallycaused by small holes or edges that dont meet and may not even be visible in an on-screen rendering. A green Yesindicates that our file is orientable and therefore seems to be free of another common defect: inside-out triangles. Nowthat we have loaded and analyzed the part we are ready to attempt to automatically repair the file.”
  • 7. STL FILE ERRORS (4) “To repair our file, press the red cross menu item in the upper right.”20
  • 7. STL FILE ERRORS (5) “Youll notice that yet another layer is created underneath the Part Analysis. The triangular mesh is now shown on the model and new options and information are available in the lower pane. Press Update to see a count of each type of error. Next, select Automatic Repair and then choose Default„. Netfabb will now go through a series of repair algorithms to attempt to make the STL file printable. (You can see what these steps are by clicking on the Repair Scripts21 tab in the lower right of the information pane.)”
  • 7. STL FILE ERRORS (6) “When the process is complete you can again press the update button under the status tab. You should see zero border edges, invalid orientations and holes. If your part is a single object (vs. an assembly) it will likely indicate the preferred 1 shell. While not optimum multiple shells will not usually cause printing problems. You should also visually verify that your model still looks the same as your original. In some cases, netfabb automatic repairs may create solids where in fact a hole was intended. This is rare but you should still check visually. Were not quite done as we still need to apply the repairs to the originally loaded file by pressing Apply Repairs in the lower right22 hand corner.”
  • 7. STL FILE ERRORS (7) “This removes the analysis and repair layers and fixes the original rendering. You should see the original green rendering - but without the red attention warning. You should also see a volume calculation. If you still see an attention warning and/or lack of volume calculation it means that netfabb was unable to completely repair your file. The file may still be printable or it may require further manual repairs. More info about manual repairs:”23 http://www.3daddfab.com/blog/index.php?/permalink/Use-netfabb-to-Manually-Repair-STL-Holes-Edges-and-More.html
  • 7. STL FILE ERRORS (8) “At this point it is important to understand that you have made no changes to your original file. If you choose "Save" you will create a new netfabb Project. Since we started this process to create a clean STL file we now need to create a new (repaired) file. Under the Part menu select "Export as" STL. This will bring up a new window. First, check that the file name and location are what you would like. netfabb will automatically create a filename composed of the original with (repaired) appended so you dont have to worry about inadvertently overwriting your original24 file. However, the location will be not necessarily be in the same folder but rather the last folder saved into.”
  • 7. STL FILE ERRORS (9) “When you press Save a new dialog will appear with another analysis of the file to be created and possible errors. It seems that this may occur because the netfabb file format contains more information than, for example, the STL format; some of the repairs it has made might therefore not be carried over. Again though, automatic repairs can be made. Press the Repair button if25 you see a large red x.”
  • 7. STL FILE ERRORS (10) “If successful, instead of a large red x you will see a green check mark. In this case, 9 seconds and a single iteration were sufficient to repair the 422 manifold edges. In other cases it might take multiple iterations and you may still have a non-zero number of errors. The most recent release of netfabb Studio Basic seems to have improved this functionality. Just keep trying until you either have a green check mark or a minimum non-changing number of errors. (if your totals go up you26 can cancel the export and select again to start fresh).”
  • 7. STL FILE ERRORS (11) “Once your file is repaired you can press Export. Congratulations, you27 now have a printable STL file.”
  • SAVING CHANGES ONSTL 28
  • EXTRA INFORMATION:SPLITTING PARTS Part impossible to print without supports 29
  • SPLITTING PARTS (2) Part impossible to print without supports 30
  • SPLITTING PARTS (3) 31
  • SPLITTING PARTS (4) “In some cases, resulting parts from a cut can contain errors, in next slides we32 explain how to solve it. If your part don‟t have errors, continue at Splitting parts 9”
  • SPLITTING PARTS (5) “The error appears because we have two overlapping surfaces. After every cut, netfabb closes all the holes that finds, but in this case we have one perimeter33 inside another, and Netfabb closes both, producing that overlap.”
  • SPLITTING PARTS (6) Remove triangles Select surface “Now we have to remove both overlapping surfaces. We can do that by selecting34 them using surface selecting tool, and then pressing delete or clicking on”
  • SPLITTING PARTS (7) Add triangles “Now we have to add triangles in order to have only one perimeter to close. In order to create new triangles we only have to click “add triangles” tool, and then click on 235 border edges to connect them through new triangles.”
  • SPLITTING PARTS (8) “When we have only one perimeter, click on “Automatic repair” and execute “default repair”. We will see how the hole is now properly closed, and then we only have to36 click on “apply repair” and say “Yes” to “Remove old part?” question.”
  • SPLITTING PARTS (9) “There are no warnings now. Do the same operations to the other cut37 part. Change the part orientation if necessary.”
  • SPLITTING PARTS (10) “Save the changes by exporting each cut as STL. Do not forget to export38 both cuts!”