A wall that is 3D printed must be either exactly twice the filament path width or more than three times to allow room for infill. Anything in between usually makes two single filament width walls with a gap in between. -- View this message in context: http://forum.openscad.org/Soft-objects-tp11094p11098.html Sent from the OpenSCAD mailing list archive at Nabble.com.

That's sounds as a good explanation. Just to male sure. With a resolution og 0.2mm dies that equal a width of Exactly 0.4mm or more than 0.6mm ? Br Thomas -- View this message in context: http://forum.openscad.org/Soft-objects-tp11094p11121.html Sent from the OpenSCAD mailing list archive at Nabble.com.

Makethiswork wrote > That's sounds as a good explanation. > Just to male sure. With a resolution og 0.2mm dies that equal a width of > Exactly 0.4mm or more than 0.6mm ? > > Br > Thomas Yes, if by resolution you mean filament width, not the layer height. 0.2mm width seems very small for typical machines but is typical for layer height. If you layer height is 0.2mm the filament width will be at least 0.3mm and typically 0.4mm or greater. -- View this message in context: http://forum.openscad.org/Soft-objects-tp11094p11125.html Sent from the OpenSCAD mailing list archive at Nabble.com.

Thank you. It was the help I needes. I am working on a makerbot mini and it was giving me trouble. I tried different settings and ; 1 mm walls => soft like rubberband. 1.5 mm and up => solid. Shells was 2 and infil 15% Br Thomas -- View this message in context: http://forum.openscad.org/Soft-objects-tp11094p11135.html Sent from the OpenSCAD mailing list archive at Nabble.com.

I was assuming a single shell. For two shells it needs to be exactly 4 filament widths or more than 5 to not leave an un-fillable gap. -- View this message in context: http://forum.openscad.org/Soft-objects-tp11094p11139.html Sent from the OpenSCAD mailing list archive at Nabble.com.

I did some experiments with Cura about 6 months back to see how it worked infill in these situations. In my ideal world, it would inject less plastic into a gap less than a nozzle width...but I don't remember if it did that. It did try quite well though. On 20/01/2015 16:40, nophead wrote: > I was assuming a single shell. For two shells it needs to be exactly 4 > filament widths or more than 5 to not leave an un-fillable gap. > > > > -- > View this message in context: http://forum.openscad.org/Soft-objects-tp11094p11139.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

It seems like a good idea but when you consider the viscosity of the plastic it needs a lot of pressure to inject it down a slot thinner than the nozzle and as the gap tends to zero the pressure would tend to infinity. Also the force on the nozzle would not be inconsiderable, so you would need a very stiff Z axis or it would lift and leave a ridge. On 20 January 2015 at 17:54, Richard Benjamin <richard@digicalm.com> wrote: > I did some experiments with Cura about 6 months back to see how it worked > infill in these situations. > In my ideal world, it would inject less plastic into a gap less than a > nozzle width...but I don't remember if it did that. It did try quite well > though. > > On 20/01/2015 16:40, nophead wrote: > >> I was assuming a single shell. For two shells it needs to be exactly 4 >> filament widths or more than 5 to not leave an un-fillable gap. >> >> >> >> -- >> View this message in context: http://forum.openscad.org/ >> Soft-objects-tp11094p11139.html >> Sent from the OpenSCAD mailing list archive at Nabble.com. >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

 I did some experiments with Cura about 6 months back to see how it
 worked infill in these situations.
 In my ideal world, it would inject less plastic into a gap less
 than a nozzle width...but I don't remember if it did that. It did
 try quite well though.

 On 20/01/2015 16:40, nophead wrote:

     I was assuming a single shell. For two shells it needs to be
     exactly 4
     filament widths or more than 5 to not leave an un-fillable gap.



     --
     View this message in context:
     http://forum.openscad.org/Soft-objects-tp11094p11139.html
     Sent from the OpenSCAD mailing list archive at Nabble.com.

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     http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org



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Hmm, yes the pressure to fully fill the gap could spoil that plan...however I have printed things that end up with two thin walls and air in between... Even a small round bridging bead at the top of each layer would prevent that. After all, the rest of the infill is usually not solid. Anyway, ... a bit off topic. On 20/01/2015 18:02, nop head wrote: > It seems like a good idea but when you consider the viscosity of the > plastic it needs a lot of pressure to inject it down a slot thinner > than the nozzle and as the gap tends to zero the pressure would tend > to infinity. Also the force on the nozzle would not be inconsiderable, > so you would need a very stiff Z axis or it would lift and leave a ridge. > > On 20 January 2015 at 17:54, Richard Benjamin <richard@digicalm.com > <mailto:richard@digicalm.com>> wrote: > > I did some experiments with Cura about 6 months back to see how it > worked infill in these situations. > In my ideal world, it would inject less plastic into a gap less > than a nozzle width...but I don't remember if it did that. It did > try quite well though. > > On 20/01/2015 16:40, nophead wrote: > > I was assuming a single shell. For two shells it needs to be > exactly 4 > filament widths or more than 5 to not leave an un-fillable gap. > > > > -- > View this message in context: > http://forum.openscad.org/Soft-objects-tp11094p11139.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

Recent versions of Simplify3D have included a fix to avoid gaps in thin walls. http://www.simplify3d.com/software/changelog/ Haven't tried the thin wall thing myself. On Tue, Jan 20, 2015 at 12:17 PM, Richard Benjamin <richard@digicalm.com> wrote: > Hmm, yes the pressure to fully fill the gap could spoil that > plan...however I have printed things that end up with two thin walls and > air in between... > > Even a small round bridging bead at the top of each layer would prevent > that. After all, the rest of the infill is usually not solid. > > Anyway, ... a bit off topic. > > > On 20/01/2015 18:02, nop head wrote: > > It seems like a good idea but when you consider the viscosity of the > plastic it needs a lot of pressure to inject it down a slot thinner than > the nozzle and as the gap tends to zero the pressure would tend to > infinity. Also the force on the nozzle would not be inconsiderable, so you > would need a very stiff Z axis or it would lift and leave a ridge. > > On 20 January 2015 at 17:54, Richard Benjamin <richard@digicalm.com> > wrote: > >> I did some experiments with Cura about 6 months back to see how it worked >> infill in these situations. >> In my ideal world, it would inject less plastic into a gap less than a >> nozzle width...but I don't remember if it did that. It did try quite well >> though. >> >> On 20/01/2015 16:40, nophead wrote: >> >>> I was assuming a single shell. For two shells it needs to be exactly 4 >>> filament widths or more than 5 to not leave an un-fillable gap. >>> >>> >>> >>> -- >>> View this message in context: >>> http://forum.openscad.org/Soft-objects-tp11094p11139.html >>> Sent from the OpenSCAD mailing list archive at Nabble.com. >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> >>> >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> > > > > _______________________________________________ > OpenSCAD mailing listDiscuss@lists.openscad.orghttp://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > -- ---------------------------------------------- Gary A. Crowell Sr., P.E. <http://www.nspe.org/>, CID+ <http://dc.ipc.org/html/default.htm> Linkedin <http://www.linkedin.com/in/garyacrowellsr> Elance <http://www.linkedin.com/redirect?url=http%3A%2F%2Fgaryacrowellsr%2Eelance%2Ecom&urlhash=kJm9> KE7FIZ <http://www.arrl.org> Things <http://www.thingiverse.com/garyacrowellsr/designs> RocketryCNC <https://www.etsy.com/shop/RocketryCNC?ref=l2-shopheader-name>

My guess would be that it adapts the filament width to match half the wall. On 20 January 2015 at 22:36, Gary Crowell <garyacrowellsr@gmail.com> wrote: > Recent versions of Simplify3D have included a fix to avoid gaps in thin > walls. > http://www.simplify3d.com/software/changelog/ > > Haven't tried the thin wall thing myself. > > On Tue, Jan 20, 2015 at 12:17 PM, Richard Benjamin <richard@digicalm.com> > wrote: > >> Hmm, yes the pressure to fully fill the gap could spoil that >> plan...however I have printed things that end up with two thin walls and >> air in between... >> >> Even a small round bridging bead at the top of each layer would prevent >> that. After all, the rest of the infill is usually not solid. >> >> Anyway, ... a bit off topic. >> >> >> On 20/01/2015 18:02, nop head wrote: >> >> It seems like a good idea but when you consider the viscosity of the >> plastic it needs a lot of pressure to inject it down a slot thinner than >> the nozzle and as the gap tends to zero the pressure would tend to >> infinity. Also the force on the nozzle would not be inconsiderable, so you >> would need a very stiff Z axis or it would lift and leave a ridge. >> >> On 20 January 2015 at 17:54, Richard Benjamin <richard@digicalm.com> >> wrote: >> >>> I did some experiments with Cura about 6 months back to see how it >>> worked infill in these situations. >>> In my ideal world, it would inject less plastic into a gap less than a >>> nozzle width...but I don't remember if it did that. It did try quite well >>> though. >>> >>> On 20/01/2015 16:40, nophead wrote: >>> >>>> I was assuming a single shell. For two shells it needs to be exactly 4 >>>> filament widths or more than 5 to not leave an un-fillable gap. >>>> >>>> >>>> >>>> -- >>>> View this message in context: >>>> http://forum.openscad.org/Soft-objects-tp11094p11139.html >>>> Sent from the OpenSCAD mailing list archive at Nabble.com. >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> Discuss@lists.openscad.org >>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>>> >>>> >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> >> >> >> >> _______________________________________________ >> OpenSCAD mailing listDiscuss@lists.openscad.orghttp://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> > > > -- > ---------------------------------------------- > Gary A. Crowell Sr., P.E. <http://www.nspe.org/>, CID+ > <http://dc.ipc.org/html/default.htm> > Linkedin <http://www.linkedin.com/in/garyacrowellsr> Elance > <http://www.linkedin.com/redirect?url=http%3A%2F%2Fgaryacrowellsr%2Eelance%2Ecom&urlhash=kJm9> > KE7FIZ <http://www.arrl.org> Things > <http://www.thingiverse.com/garyacrowellsr/designs> RocketryCNC > <https://www.etsy.com/shop/RocketryCNC?ref=l2-shopheader-name> > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > >