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High-tech Koozie (customizable)

by DrLex Oct 20, 2019
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A good improvement would be that the interior may contain some frozen water inside the spiral. Iam printing the 1st test for 473cm3 cans

Do not give importance to my previous message, I just feared print it and this is fantastic! Right now it is very hot here and the beer can is frozen for almost an hour! I LOVE U MEN!

I found that the code produced a non-manifold model with 7 shells and 24 holes for my koozie. FlashPrint 3.25.0 had indicated there were errors and I used Netfabb Basic 7.4 to find out the details. The JSON for my koozie:

  "Canada 355 ml": {
        "air_gap": "5",
        "baffle_dist": "16",
        "baffle_wall": "0.8",
        "bottom_thick": "0.8",
        "can_dia": "65.8",
        "can_height": "104",
        "chamfer": "0.6",
        "outer_wall": "0.8",
        "segments": "128",
        "support_height": "3",
        "support_width": "1.2",
        "test_slice": "no",
        "tolerance": "0.1",
        "top_cut": "0.6"

I know from past experience with my own OpenSCAD code that a fudge factor is often needed when using Boolean functions to avoid non-manifold meshes caused by exactly overlapping geometries. After briefly examining the code, I added a fudge factor at line 90 and it resulted in my koozie being rendered without errors. I don't know if that's the best or only place that is needed, but it worked for my particular koozie.

 <     shift = baffle_radius - in_wall_radius - baffle_wall;
 >     shift = baffle_radius - in_wall_radius - baffle_wall - 0.0001;

I solved it without a fudge factor by changing the > on line 130 into >=. This will add the gap-filling cone even when theoretically there is no gap but there could be one in practice due to limited numeric accuracy.

Ich bin von dem Design begeistert und möchte es gern drucken. Meine Lieblingsdose hat aber 500 ml Inhalt (Bier) und einen Aussendurchmesser von 65,4 mm. Deshalb kann ich die offensichtlichen Vorteile dieser Dose nicht geniessen.
Trotzdem Danke für das Design

PS.: Ich glaube auch, dass es besser wäre die 6 Füsse nach aussen zu verlagern. Wegen der Luftzirkulation.

This is customizable, so you can generate your own 3D model that fits your can. Try the “Open in Customizer” button (or this link). Because the Thingiverse website is very unreliable, you may prefer to download the .scad file and follow these instructions instead.

I'm not sure what you mean by extending the 6 feet. If you mean dividing all the compartments into 6 sections, there is not much use in doing that because the convection happens only vertically under normal circumstances.

How to run Customizer on your own computer
by DrLex

Danke! Ich werde es ausprobieren.

PS.: Der erste Probedruck läuft inzwischen. Openscad war der Retter und natürlich DrLex.