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# Polyhole tester: unexpected result after printing

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## Polyhole tester: unexpected result after printing

 In a parallel thread I posted about a SCAD I'd just edited. It was neatly printing my 18 minute remix of nophead's original with a few minutes to go, so I left it to finish and cool. When I returned there was nothing on the bed apart from the small skirt! After raising the hot end of my Ender 3 V2 I quickly found it, stuck hard to the nozzle. https://www.dropbox.com/s/nlrcbnugh1hsnv0/20210413-AWOL-PolyholeTest.jpg?dl=0httraw=1(BTW, I initially tried 'Insert Image', but it rotated my photo 90 degs.) After reheating I pulled it off and there was a mess looking like a distorted, hollow cylinder in the corner near but not covering the largest (4mm) hole. The sliced STL looks OK in Cura to my inexperienced eye. Here's a screenshot showing the very end of its animated preview. https://www.dropbox.com/s/jhqm4divmp9wrxk/Polyholes-e1-Cura-DQ-Preview.jpg?raw=1But before I pursue my Cura settings and other causes I'd appreciate confirmation that it's not some basic error in my SCAD file please. (I'm assuming code can be pasted directly, with no special tags?) module polyhole(h, d) {     n = max(round(2 * d),3);     rotate([0,0,180])         cylinder(h = h, r = (d / 2) / cos (180 / n), \$fn = n); } difference() {         translate ([5,4,0]) cube(size = [25,20,3]);     union() {     for(i = [2:4]) {             translate([(i * i + i)/2 + 3 * i , 10,-1])                 polyhole(h = 5, d = i);                             assign(d = i + 0.5)                 translate([(d * d + d)/2 + 3 * d, 17,-1])                     polyhole(h = 5, d = d);     }     } } 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: Polyhole tester: unexpected result after printing

 Sounds like an adhesion problem while printing.  This has nothing to do with OpenSCAD and everything to do with the "stickiness" of the printer bed and/or the geometry of the part (perhaps too little surface area).  Since the part is wide and deep and flat, I would check on your bed adhesion (bed temperature, glue stick or hair spray on the bed surface, etc) Jon On 4/14/2021 5:37 AM, Terrypin via Discuss wrote: > _______________________________________________ > 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: Polyhole tester: unexpected result after printing

 In reply to this post by OpenSCAD mailing list-2 As you say, you are new to Cura. You need to tune the printer to match the filament, and get the correct settings into cura. It is not as easy as the adverts say. First, level bed, then get the z offset set. Install the cura extensions for test prints, run the temperature tower, and others. Make sure your extruder steps are correct. Nothing wrong with the scad file. The rest of it is up to the printer settings. If it was easy, everybody would be doing it. Best wishes, Ray On 14/04/2021 10:37, Terrypin via Discuss wrote: > > module polyhole(h, d) { >     n = max(round(2 * d),3); >     rotate([0,0,180]) >         cylinder(h = h, r = (d / 2) / cos (180 / n), \$fn = n); > } > > > difference() { >         translate ([5,4,0]) cube(size = [25,20,3]); >     union() { >     for(i = [2:4]) { >             translate([(i * i + i)/2 + 3 * i , 10,-1]) >                 polyhole(h = 5, d = i); > >             assign(d = i + 0.5) >                 translate([(d * d + d)/2 + 3 * d, 17,-1]) >                     polyhole(h = 5, d = d); >     } >     } > } _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email]
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## Re: Polyhole tester: unexpected result after printing

 In reply to this post by OpenSCAD mailing list-2 Nothing wrong with the scad/stl (but warning wrt assign DEPRECATED: The assign() module will be removed in future releases. Use a regular assignment instead. in file , line 16 It will print fine, provided you've got the correct settings in cura for your printer and filament. You need to run some tests to set it up properly On 14/04/2021 10:37, Terrypin via Discuss wrote: _______________________________________________ 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: Polyhole tester: unexpected result after printing

 In reply to this post by jon_bondy Thanks for quickly ruling that out. I’ll focus on adhesion. The skirt did seem OK at the start, visually, but I should have tried brushing it gently with a finger to be sure. With the entire print weighing a mere 2gm I suppose it got lifted off. 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: Polyhole tester: unexpected result after printing

 start by levelling the bed - this will be fine for any printer https://www.youtube.com/watch?v=_EfWVUJjBdA&t=221s  Chuck has a a number of videos on setting up printers,  worth watching. On 14/04/2021 13:36, Terrypin via Discuss wrote: > _______________________________________________ > 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: Polyhole tester: unexpected result after printing

 Thanks for those three helpful posts mondo. I guess we’re OT now but...I swapped the original springs for the improved (stiffer?) ones and did spend a lot of time on bed levelling. But clearly don’t yet have it 100% sorted! P.S. How do I edit a post? Using ‘Edit this page’ plainly isn’t the way. 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: Polyhole tester: unexpected result after printing

 For accurate holes you want a single outline, or make sure the outer ones (inner in holes) are done first. When you stack extrusions next to each other the exact width depends on the viscosity of the plastic, which the slicer doesn't know about.On Wed, 14 Apr 2021 at 14:13, Terrypin via Discuss <[hidden email]> wrote:---------- Forwarded message ----------From: Terrypin <[hidden email]>To: [hidden email]Cc: Bcc: Date: Wed, 14 Apr 2021 06:13:11 -0700 (MST)Subject: [OpenSCAD] Re: Polyhole tester: unexpected result after printingThanks for those three helpful posts mondo. I guess we’re OT now but...I swapped the original springs for the improved (stiffer?) ones and did spend a lot of time on bed levelling. But clearly don’t yet have it 100% sorted! P.S. How do I edit a post? Using ‘Edit this page’ plainly isn’t the way. Terry Sent from the OpenSCAD mailing list archive at Nabble.com.---------- Forwarded message ----------From: Terrypin via Discuss <[hidden email]>To: [hidden email]Cc: Terrypin <[hidden email]>Bcc: Date: Wed, 14 Apr 2021 06:13:11 -0700 (MST)Subject: [OpenSCAD] Re: Polyhole tester: unexpected result after printing_______________________________________________ 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: Polyhole tester: unexpected result after printing

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## Re: Polyhole tester: unexpected result after printing

In reply to this post by mondo

> P.S. How do I edit a post? Using ‘Edit this page’ plainly isn’t the way.

The Forum is pretty much static, you should post a new message.

BUT, as it will tell you, it doesn't send out a revised email, so nobody sees it, and you will lose attachments/images. (I didn't design it)

From: Terrypin [mailto:[hidden email]]
Sent: Wed, 14 Apr 2021 23:13
To: [hidden email]
Subject: [OpenSCAD] Re: Polyhole tester: unexpected result after printing

Thanks for those three helpful posts mondo. I guess we’re OT now but...I swapped the original springs for the improved (stiffer?) ones and did spend a lot of time on bed levelling. But clearly don’t yet have it 100% sorted!

P.S. How do I edit a post? Using ‘Edit this page’ plainly isn’t the way.

Terry

Sent from the OpenSCAD mailing list archive at Nabble.com.

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