Adding additional extrusion to a raft (raft with a skirt?)

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I started using rafts more often, to get better results with complex or fragile parts, but my Ender 3 consistently under-extrudes the initial outside line of the raft (for the first inch or two, where extrusion starts).



It is often very thin and does not adhere. This often leads to problems with the following pattern of raft layer 1 curling up (ABS) as it does not meet the edge line (due to the 1-2 inch gap in the perimeter).



Skirts avoid this problem by getting the flow going, but rafts only print a single outer line.



  1. Is it possible to specify more than one outer line on a raft in Cura?

  2. Is it possible to add a skirt to a print that has a raft (or at least some initial printing to get the flow going)?

  3. Is it possible to add some initial G-Code that will extrude a line, say from near the start position to the start of the print?









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    up vote
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    I started using rafts more often, to get better results with complex or fragile parts, but my Ender 3 consistently under-extrudes the initial outside line of the raft (for the first inch or two, where extrusion starts).



    It is often very thin and does not adhere. This often leads to problems with the following pattern of raft layer 1 curling up (ABS) as it does not meet the edge line (due to the 1-2 inch gap in the perimeter).



    Skirts avoid this problem by getting the flow going, but rafts only print a single outer line.



    1. Is it possible to specify more than one outer line on a raft in Cura?

    2. Is it possible to add a skirt to a print that has a raft (or at least some initial printing to get the flow going)?

    3. Is it possible to add some initial G-Code that will extrude a line, say from near the start position to the start of the print?









    share|improve this question







    New contributor




    Gone Coding is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      I started using rafts more often, to get better results with complex or fragile parts, but my Ender 3 consistently under-extrudes the initial outside line of the raft (for the first inch or two, where extrusion starts).



      It is often very thin and does not adhere. This often leads to problems with the following pattern of raft layer 1 curling up (ABS) as it does not meet the edge line (due to the 1-2 inch gap in the perimeter).



      Skirts avoid this problem by getting the flow going, but rafts only print a single outer line.



      1. Is it possible to specify more than one outer line on a raft in Cura?

      2. Is it possible to add a skirt to a print that has a raft (or at least some initial printing to get the flow going)?

      3. Is it possible to add some initial G-Code that will extrude a line, say from near the start position to the start of the print?









      share|improve this question







      New contributor




      Gone Coding is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I started using rafts more often, to get better results with complex or fragile parts, but my Ender 3 consistently under-extrudes the initial outside line of the raft (for the first inch or two, where extrusion starts).



      It is often very thin and does not adhere. This often leads to problems with the following pattern of raft layer 1 curling up (ABS) as it does not meet the edge line (due to the 1-2 inch gap in the perimeter).



      Skirts avoid this problem by getting the flow going, but rafts only print a single outer line.



      1. Is it possible to specify more than one outer line on a raft in Cura?

      2. Is it possible to add a skirt to a print that has a raft (or at least some initial printing to get the flow going)?

      3. Is it possible to add some initial G-Code that will extrude a line, say from near the start position to the start of the print?






      cura extrusion ender-3






      share|improve this question







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          2 Answers
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          You need to add some extrusion of filament in your start G-code.



          Personally, I like the style of Ultimaker where prior to printing, a puddle of filament is deposited priming the nozzle adequately. Basically you need to move to a position where you like to deposit filament:



           G1 X10 Y10 Z2


          Then you need to extrude material



           G1 F125
          G1 E10
          G1 Z3 E5


          After that you can even wipe the nozzle.






          share|improve this answer





























            up vote
            1
            down vote













            It's not necessarily the case that the apparent underextrusion of a small portion of your raft is the root cause. ABS is notorious for shrinkage and peeling. As a start, you should have a full enclosure so as to maintain a warm environment while printing.



            It's also quite possible that your bed is slightly off-level or a few microns low for the first layer, either of which can cause adhesion problems.



            Yes, it's pretty much trivial to add a few lines of gcode to extrude prior to the "official" raft -- or you could just toss a fake small object into your slicer to extend the raft over both the real and the fake parts.



            FWIW, with a little care I've found a wide brim outperforms a raft for almost anything I print






            share|improve this answer




















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              2 Answers
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              active

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              2 Answers
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              active

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              active

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              up vote
              2
              down vote













              You need to add some extrusion of filament in your start G-code.



              Personally, I like the style of Ultimaker where prior to printing, a puddle of filament is deposited priming the nozzle adequately. Basically you need to move to a position where you like to deposit filament:



               G1 X10 Y10 Z2


              Then you need to extrude material



               G1 F125
              G1 E10
              G1 Z3 E5


              After that you can even wipe the nozzle.






              share|improve this answer


























                up vote
                2
                down vote













                You need to add some extrusion of filament in your start G-code.



                Personally, I like the style of Ultimaker where prior to printing, a puddle of filament is deposited priming the nozzle adequately. Basically you need to move to a position where you like to deposit filament:



                 G1 X10 Y10 Z2


                Then you need to extrude material



                 G1 F125
                G1 E10
                G1 Z3 E5


                After that you can even wipe the nozzle.






                share|improve this answer
























                  up vote
                  2
                  down vote










                  up vote
                  2
                  down vote









                  You need to add some extrusion of filament in your start G-code.



                  Personally, I like the style of Ultimaker where prior to printing, a puddle of filament is deposited priming the nozzle adequately. Basically you need to move to a position where you like to deposit filament:



                   G1 X10 Y10 Z2


                  Then you need to extrude material



                   G1 F125
                  G1 E10
                  G1 Z3 E5


                  After that you can even wipe the nozzle.






                  share|improve this answer














                  You need to add some extrusion of filament in your start G-code.



                  Personally, I like the style of Ultimaker where prior to printing, a puddle of filament is deposited priming the nozzle adequately. Basically you need to move to a position where you like to deposit filament:



                   G1 X10 Y10 Z2


                  Then you need to extrude material



                   G1 F125
                  G1 E10
                  G1 Z3 E5


                  After that you can even wipe the nozzle.







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited 2 hours ago

























                  answered 2 hours ago









                  0scar

                  7,29611138




                  7,29611138




















                      up vote
                      1
                      down vote













                      It's not necessarily the case that the apparent underextrusion of a small portion of your raft is the root cause. ABS is notorious for shrinkage and peeling. As a start, you should have a full enclosure so as to maintain a warm environment while printing.



                      It's also quite possible that your bed is slightly off-level or a few microns low for the first layer, either of which can cause adhesion problems.



                      Yes, it's pretty much trivial to add a few lines of gcode to extrude prior to the "official" raft -- or you could just toss a fake small object into your slicer to extend the raft over both the real and the fake parts.



                      FWIW, with a little care I've found a wide brim outperforms a raft for almost anything I print






                      share|improve this answer
























                        up vote
                        1
                        down vote













                        It's not necessarily the case that the apparent underextrusion of a small portion of your raft is the root cause. ABS is notorious for shrinkage and peeling. As a start, you should have a full enclosure so as to maintain a warm environment while printing.



                        It's also quite possible that your bed is slightly off-level or a few microns low for the first layer, either of which can cause adhesion problems.



                        Yes, it's pretty much trivial to add a few lines of gcode to extrude prior to the "official" raft -- or you could just toss a fake small object into your slicer to extend the raft over both the real and the fake parts.



                        FWIW, with a little care I've found a wide brim outperforms a raft for almost anything I print






                        share|improve this answer






















                          up vote
                          1
                          down vote










                          up vote
                          1
                          down vote









                          It's not necessarily the case that the apparent underextrusion of a small portion of your raft is the root cause. ABS is notorious for shrinkage and peeling. As a start, you should have a full enclosure so as to maintain a warm environment while printing.



                          It's also quite possible that your bed is slightly off-level or a few microns low for the first layer, either of which can cause adhesion problems.



                          Yes, it's pretty much trivial to add a few lines of gcode to extrude prior to the "official" raft -- or you could just toss a fake small object into your slicer to extend the raft over both the real and the fake parts.



                          FWIW, with a little care I've found a wide brim outperforms a raft for almost anything I print






                          share|improve this answer












                          It's not necessarily the case that the apparent underextrusion of a small portion of your raft is the root cause. ABS is notorious for shrinkage and peeling. As a start, you should have a full enclosure so as to maintain a warm environment while printing.



                          It's also quite possible that your bed is slightly off-level or a few microns low for the first layer, either of which can cause adhesion problems.



                          Yes, it's pretty much trivial to add a few lines of gcode to extrude prior to the "official" raft -- or you could just toss a fake small object into your slicer to extend the raft over both the real and the fake parts.



                          FWIW, with a little care I've found a wide brim outperforms a raft for almost anything I print







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 3 hours ago









                          Carl Witthoft

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                          1,994314




















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