Weird print failure - advice sought  

RE: Weird print failure - advice sought

Not sure why the project file is refusing to attach...

RE: Weird print failure - advice sought

You have to zip most file types files to attach them. 

It does look as if a small layer shift was followed by a slow warp - please show us the underside of the failed print.

Zip your part file before attaching.

Cheerio,

RE: Weird print failure - advice sought

Here are a couple underside views, and an attempt to attach the project as a zip (thank you!)

RE: Weird print failure - advice sought

Thank you.  It seems the part partially detached and slowly aligned to a new position under the stress from the cooling contraction of the longer extrusion runs.

Although you have set a brim it's not connected to the part - Set: Print Settings > Advanced > Elephant's foot compensation:    to zero.

If it's possible, also adjust the design so the grips have a larger footprint - maybe substitute some of the under-curve for a shallow chamfer to increase the diameter at the print sheet.

And protect the printer from drafts.

Cheerio,

RE: Weird print failure - advice sought

Hmm, OK thank you.  I thought it seemed like it was still firmly upright but now I'm doubting myself.  The brim was attached to the supports at the handgrips, I'll try changing that setting and check it in the slicer.

(The design itself is from Bruce Lucas on printables, I don't have the skills to make something with ergonomic curves myself 🙂 )

I thought it seemed like it was still firmly upright but now I'm doubting myself.

The lift line is visible in your pictures.

I don't have the skills to make something with ergonomic curves myself

It looks fairly simple, quite a good subject for a first project, suitable for an OpenSCAD beginner.  I'd be tempted to enlarge the top surface enough that the whole thing could be printed upside down and so avoid support.

Cheerio,

RE: Weird print failure - advice sought

It is?  I'm not understanding what you're seeing, even though I have the thing in my hand.  Can you elaborate on what you mean by "lift line"?

I greatly appreciate your help!

ken

Look for a change of texture or drop a straightedge across, one side of the line has detached from the bed:

Cheerio,

I don't have the skills to make something with ergonomic curves myself

Here is a quick and dirty OpenSCAD script that should, once you have copied and pasted it and edited in your correct dimensions, make a useable part.  OpenSCAD is free to download and open source so well worth learning the basics for something like this, tinker with this as you learn.

// Drop-in controller holder

//  All of these figures are user editable in millimetres
//  measure the parts and enter your desired values.

//  Edit to suit your hands
gripdiamax=40;
gripdiamin=30;
gripheight=85;
gripmaxheight=70; // How far from bottom is widest part

// Measure your controller...
controllerwidth=280;
controllerdepth=15;
// controllerheight not set, it is assumed support height is enough

socketdepth=10;

supportheight=60; // height of support bar
supportthick=3;   // and thickness

// curve smoothing
$fn=50;

// Designed upside down for easier, support-free printing.

difference(){
  union(){
    grip();
    translate([0,controllerdepth/2,0]){
      cube([controllerwidth+socketdepth*2,supportthick,supportheight]);
    }
    translate([controllerwidth+socketdepth*2,0,0]){
      grip();
    }
  }
  // Subtract the shape of the controller from the holder to make a socket
  translate([socketdepth,-controllerdepth/2,0]){
    controllershape();
  } 
}


module grip(){
  // Shape the grip with two cone sections
  cylinder(d1=gripdiamin,d2=gripdiamax,h=gripheight-gripmaxheight);
  translate([0,0,gripheight-gripmaxheight]){
    cylinder(d1=gripdiamax,d2=gripdiamin,h=gripmaxheight-(gripdiamin/2));
  }
  // and dome the bottom end
  translate([0,0,gripheight-(gripdiamin/2)]){
    sphere(d=gripdiamin);
  }
}

module controllershape(){
  // very crude, should be edited to actual shape with about 1mm of tolerance
  cube([controllerwidth,controllerdepth,supportheight]);
}

Cheerio,

RE: Weird print failure - advice sought

You have a heck of an eye ... if I put the light on it just right I can kinda see the line you're talking about.

Thanks again for the help!

RE: Weird print failure - advice sought

Posted by: @diem

Here is a quick and dirty OpenSCAD script that should, once you have copied and pasted it and edited in your correct dimensions, make a useable part.  OpenSCAD is free to download and open source so well worth learning the basics for something like this, tinker with this as you learn.

 

Great!  I'll give that a try - I would like fatter grips, I'll see how far this gets me!

ken