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OpenSCAD source code: MPCNC knife adapter modified for cheap eBay collet pen holder
// Adding clearance for eBay collet pen holder
MPCNC_OD = 12.0; // pen holder OD (matches STL curvature)
MPCNC_Z = 8.9; // Z offset of pen axis
Pen_OD = 11.5; // actual pen body OD
ID = 0;
OD = 1;
LENGTH = 2;
Flange = [11.5,15.7,2.2]; // actual pen body flange
Locknut = [16.0,16.0,2.8]; // knurled locknut
Locknut_Offset = 4.5; // flange center to locknut
Wall = [41.0,4 * 0.4,9.0]; // thicker walls for more spring and better fill
$fn = 32; // default cylinder sides
difference() {
translate([-(101.3 + MPCNC_OD/2),-111.9,0]) // put pen axis above Y axis, flange centered on X axis
import("/mnt/bulkdata/Project Files/Mostly Printed CNC/Accessories/Tool Holders/MPCNC_525_Drag_Knife-1860310.STL",
convexity=5);
if (true) // improve holder-to-mount fit if needed
translate([0,60/2,8.90])
rotate([90,0,0])
cylinder(d=MPCNC_OD,h=60);
translate([0,0,MPCNC_Z]) // improve flange slot clearance
rotate([90,0,0])
cylinder(d=Flange[OD] + 1.0,h=Flange[LENGTH] + 0.5,center=true);
translate([0,Locknut_Offset - 0.5,MPCNC_Z]) // add locknut clearance
rotate([-90,0,0])
cylinder(d=Locknut[OD] + 1.5,h=Locknut[LENGTH] + 1.5,center=false);
}
# translate([-(27.0 + Wall.x/2),0,0]) { // embiggen walls for higher spring constant
translate([0,-24.4,0])
cube(Wall);
translate([0,20.6 - Wall.y,0])
cube(Wall);
}
@ednisley

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ednisley commented Oct 7, 2018

More details on my blog at https://wp.me/poZKh-7LG

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