I designed a simple hand hold that I can screw onto a surface and then
slip my hand into to lift something up, a kind of a handle.

The indicated edge would do much better were it rounded.

Suggestions?

Jon

include <BOSL2/std.scad>

$fa = 3;
$fs = 0.2;

hw = 80;    // hand width (X)
hl = 60;    // hand length (Y)
ht = 25;    // hand thickness (Z)

module Shape()
scale([hw/100, 2hl/100, 2ht/100])
sphere(d = 100);

difference() {
intersection() {
scale(1.2)
Shape();
left(100)
cube(200);
}
Shape();
}

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https://github.com/BelfrySCAD/BOSL2/wiki/masks.scad#module-rounding_cylinder_mask
https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_BelfrySCAD_BOSL2_wiki_masks.scad-23module-2Drounding-5Fcylinder-5Fmask&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=Ie0rLmWfu3ytIc66CUR7iFh_8sk8jpGLfQwQNOHPGk6y8R1J85gWkncGV0VO_F0d&s=EON4XnclXI2xwME1EdIGSz-JTx3RB2oYpCKg0IyuPEk&e=

Use rounding_cylinder_mask() on the outer edge, use
rounding_hole_mask() for the inner edge.

Dan

On Wed, Apr 22, 2026 at 1:40 PM Jon Bondy via Discuss
discuss@lists.openscad.org wrote:

 I designed a simple hand hold that I can screw onto a surface and
 then slip my hand into to lift something up, a kind of a handle.

 The indicated edge would do much better were it rounded.

 Suggestions?

 Jon


 include <BOSL2/std.scad>

 $fa = 3;
 $fs = 0.2;

 hw = 80;    // hand width (X)
 hl = 60;    // hand length (Y)
 ht = 25;    // hand thickness (Z)

 module Shape()
     scale([hw/100, 2*hl/100, 2*ht/100])
         sphere(d = 100);

 difference() {
     intersection() {
         scale(1.2)
             Shape();
             left(100)
                 cube(200);
             }
     Shape();
     }


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I designed a simple hand hold that I can screw onto a surface and then
slip my hand into to lift something up, a kind of a handle.

The indicated edge would do much better were it rounded.

Suggestions?

Jon

include <BOSL2/std.scad>

$fa = 3;
$fs = 0.2;

hw = 80;    // hand width (X)
hl = 60;    // hand length (Y)
ht = 25;    // hand thickness (Z)

module Shape()
    scale([hw/100, 2hl/100, 2ht/100])
        sphere(d = 100);

difference() {
    intersection() {
        scale(1.2)
            Shape();
            left(100)
                cube(200);
            }
    Shape();
    }

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if the concept was to fix something using bosl2, then I cannot help, but if the idea was to create a simple, comfortable, resizeable handle, using openscad, then the following is useable. Obviously play with the paramaters, d, translate, scale, etc, to get to what suits you, or not...