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# cura screw up?

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## cura screw up?

 Back again, new printer yadda yadda; I have this .scad file: ... // new example, low ratio harmonic drive floating splined belt. // s/b 30/1 when finished. Amateur at work. // 12 mm height before scale, no effect below // size of tooth, all in mm's, no effect below teeth = 60; // define number  of teeth arcx = ( 360 / teeth ); // arc of circle per tooth \$fr = 0.000000; toothdia = (5.9*arcx); max=53.55;// curiosity min=49.50;// ditto total=min+max;//ditto toothcirc=(total / 3.76);// sets tooth circle at center with tooth  //overlap at base height=12; // mm's echo (14, teeth, arcx, toothdia, toothcirc, \$fr) ;  // echo? yes, once union() { difference() { // inside smoother     cylinder(d=53.60, h=12, \$fn=90,center=true);//overlap isn't fussy     cylinder(d=52.70, h=12, \$fn=360,center=true);// but inner face is     } // for 6 we'll get 60 teeth for(\$fr=[ 0: 6 : 359 ]){ rotate([0, 0, \$fr]) // works, finally translate([toothcirc, 0, 0])  // mv x=[\$lr + \$r1] y,z=0 scale(v= [.100, .100, 1.00]) // might use a small diferential // here to improve tooth fit by changing the angle. cylinder(d=toothdia, h=height, \$fn=3, center=true); // make //thick triangle } }; ... looks great in openscad preview. Give or take a fraction of a mm for perfect fit.  But export the .stl into cura, and its fubared on the build plate. cura, in additiion to a ton of stringing, and uncounted retractions is inserting an extra somewhat loose inside layer for about 1/8 of the circle that is only attached at the joint location of the tooth base overlap. I have broken 3 of these trying to cut the stringing and this extra stuff away. So, what am I doing wrong that confuses cura? Thanks all. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty:  soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable.  - Louis D. Brandeis Genes Web page _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]
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## Re: cura screw up?

 Gene Heskett wrote So, what am I doing wrong that confuses cura? The cynic in me says "using it". I don't, so I can't test, but you might want to try changing the inner cylinder to a height of 13, and the cylinder to a height of height-.005. A preview (F5) will show you why. Try that on Cura. Sent from the OpenSCAD mailing list archive at Nabble.com._______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]
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## Re: cura screw up?

 Annotated screenshot shows both your original and increasing h to 13 in line 19. Made OpenSCAD preview much cleaner, but can't see any significant difference in Cura? Or higher res here: https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?raw=1P.S. I've heard of two cases where Gmail decides my images are spam. Would appreciate feedback of any other cases please, to help me isolate cause. Terry Sent from the OpenSCAD mailing list archive at Nabble.com._______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]
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## Re: cura screw up?

 Re spam issue ... is it that it's deciding that there is too much skin tone and therefore "porn" ?? At one place I worked they had such a porn filter - the problem was that marketing (bless their cotton socks) made a point of highlighting business news by sending out scans of cuttings of the Financial Times that tripped the porn filter every time! (the paper used was pink - not sure if still is). Dave On 19/06/2021 16:24, Terrypin wrote: Annotated screenshot shows both your original and increasing h to 13 in line 19. Made OpenSCAD preview much cleaner, but can't see any significant difference in Cura? Or higher res here: https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?raw=1 P.S. I've heard of two cases where Gmail decides my images are spam. Would appreciate feedback of any other cases please, to help me isolate cause. Terry Sent from the OpenSCAD mailing list archive at Nabble.com. ```_______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email] ``` _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]
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## Re: cura screw up?

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## Re: cura screw up?

 In reply to this post by Terrypin On Saturday 19 June 2021 11:24:23 Terrypin wrote: > Annotated screenshot shows both your original and increasing h to 13 > in line 19. Made OpenSCAD preview much cleaner, but can't see any > significant difference in Cura? > > > > Or higher res here: > https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?raw>=1 > w=1> > > P.S. I've heard of two cases where Gmail decides my images are spam. > Would appreciate feedback of any other cases please, to help me > isolate cause. > > Terry > See my other post, Terrypin. I think its fixed, the problem never was visible even in curas previews, only showing up on the build plate. It was a combo of the wrong driver, and an stl that was vertically centered with 6mm below the plate and 6mm above. Now all I am getting to clean up is lots of stringing across the open spaces.  That will be much easier to clean up.  Now if its the correct size. That will take another 2 hours to define. > Thank you a lot for your efforts. > > -- > Sent from: http://forum.openscad.org/Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty:  soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable.  - Louis D. Brandeis Genes Web page _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]
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## Re: cura screw up?

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## Re: cura screw up?

 In reply to this post by Gene Heskett Gene Heskett wrote See my other post, Terrypin. I think its fixed, the problem never was visible even in curas previews, only showing up on the build plate. It was a combo of the wrong driver, and an stl that was vertically centered with 6mm below the plate and 6mm above. Check to see if Cura has a "Lie flat" button. Slic3r and Prusa Slicer both have it. That way, it doesn't matter where the stl thinks it is vertically, or even it it's tilted. It will plop it down to Z=0, and show you what corrections it made when you look at the 'Rotate" setting. Sent from the OpenSCAD mailing list archive at Nabble.com._______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]
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## Re: cura screw up?

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## Re: cura screw up?

 In reply to this post by lar3ry On Saturday 19 June 2021 13:37:02 lar3ry wrote: > Gene Heskett wrote > > > See my other post, Terrypin. I think its fixed, the problem never > > was visible even in curas previews, only showing up on the build > > plate. It was a combo of the wrong driver, and an stl that was > > vertically centered with 6mm below the plate and 6mm above. > > Check to see if Cura has a "Lie flat" button. Slic3r and Prusa Slicer > both have it. That way, it doesn't matter where the stl thinks it is > vertically, or even it it's tilted. It will plop it down to Z=0, and > show you what corrections it made when you look at the 'Rotate" > setting. > Cura has all that. And the next print that was in progress, cleaned up of all the stringing, about .1mm too big. Pretty good for a SWAG.  Making the next one with 30% more infill in gyroid pattern, .1mm smaller, which will also improve the wall strength a teeny amount.  Then it might be time to rig it on the motor, add some plastic lube on the bb's and drive it for a day to see what if anything breaks.  Added a mm to the retraction got rid of most of the stringing. At 2mm high its a whole lot cleaner a print. If it doesn't plug up. It is still using retractions by the thousands.  And I still don't have a side fan, its hot enough to burn a finger but not running. I've sent a msg to the vendor but no reply as yet. PETG doesn't want it, but this is the starter PLA. Thanks lar3ry. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty:  soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable.  - Louis D. Brandeis Genes Web page _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]