Felipe M.
ebd213f053
Parametric dust cover that clips onto the outer rim of a standard 1kg (200mm) filament spool. Features diagonal clip ramps for supportless printing and customizable dimensions for different spool sizes.
151 lines
4.7 KiB
OpenSCAD
151 lines
4.7 KiB
OpenSCAD
// ============================================
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// Filament Spool Cover
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// ============================================
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// A circular dust cover that clips onto the outer rim
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// of a filament spool. Snap-fit clips around the
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// perimeter grip the spool edge to hold the cover
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// in place.
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//
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// Coordinate system:
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// Origin (0,0,0) = center of the cover disc, bottom face
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// X/Y = radial plane of the disc
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// Z = upward (skirt and clips extend in +Z)
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// ============================================
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// CUSTOMIZABLE PARAMETERS
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// ============================================
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/* [Spool] */
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// Outer diameter of the filament spool
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spool_outer_diameter = 200; // [150:1:220]
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// Thickness of the spool rim (the edge clips grab)
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spool_rim_thickness = 1; // [1:0.5:5]
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/* [Cover] */
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// Thickness of the cover disc
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cover_thickness = 1.5; // [1:0.5:3]
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// Height of the skirt that wraps around the spool rim
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skirt_height = 5; // [3:0.5:10]
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// Thickness of the skirt wall
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skirt_wall = 1.2; // [0.8:0.1:2.0]
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/* [Clips] */
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// Number of clips around the perimeter
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clip_count = 3; // [3:1:12]
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// Angular width of each clip in degrees
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clip_arc = 15; // [5:1:30]
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// Depth of the clip lip that hooks under the rim
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clip_lip_depth = 1.5; // [0.5:0.1:3]
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// Clearance gap for snap fit
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clip_clearance = 0.3; // [0.1:0.05:0.6]
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/* [Quality] */
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// Rendering resolution
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resolution = 120; // [60:10:200]
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// ============================================
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// PARAMETER VALIDATION
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// ============================================
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assert(spool_outer_diameter > 0, "Spool outer diameter must be positive");
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assert(spool_rim_thickness > 0, "Spool rim thickness must be positive");
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assert(cover_thickness >= 1, "Cover thickness should be at least 1mm");
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assert(skirt_height > spool_rim_thickness, "Skirt must be taller than rim thickness to clip");
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assert(clip_count >= 3, "Need at least 3 clips for a secure hold");
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assert(clip_lip_depth > 0, "Clip lip depth must be positive");
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// ============================================
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// DERIVED DIMENSIONS
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// ============================================
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spool_radius = spool_outer_diameter / 2;
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// Inner radius of the skirt sits just outside the spool rim
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skirt_inner_radius = spool_radius + clip_clearance;
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skirt_outer_radius = skirt_inner_radius + skirt_wall;
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// ============================================
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// MAIN ASSEMBLY
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// ============================================
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cover();
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// ============================================
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// COMPONENT MODULES
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// ============================================
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// Full cover assembly: disc + skirt + clips
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module cover() {
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union() {
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cover_disc();
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skirt();
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clips();
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}
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}
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// Flat circular disc that covers the spool face (sits on the build plate)
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module cover_disc() {
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cylinder(h=cover_thickness, r=skirt_outer_radius, $fn=resolution);
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}
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// Continuous ring around the edge that extends upward from the disc
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module skirt() {
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translate([0, 0, cover_thickness])
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difference() {
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cylinder(h=skirt_height, r=skirt_outer_radius, $fn=resolution);
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translate([0, 0, -0.01])
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cylinder(h=skirt_height + 0.02, r=skirt_inner_radius, $fn=resolution);
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}
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}
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// Evenly spaced snap clips at the top of the skirt
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module clips() {
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for (i = [0 : clip_count - 1]) {
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rotate([0, 0, i * (360 / clip_count)])
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clip();
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}
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}
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// Single snap clip: lip at top grabs the rim, diagonal ramp below for supportless printing
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// Cross-section profile (radial view, outer left, inner right):
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//
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// |_____| <- skirt top: lip extends inward to grab rim
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// | / |
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// | / |
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// | / |
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// |/ |
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// | | <- skirt base
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//
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// The diagonal ramp prints without supports.
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module clip() {
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eps = 0.01;
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base_z = cover_thickness;
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ramp_height = skirt_height - spool_rim_thickness;
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// Full clip profile as a single polygon, extruded as an arc
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// Coordinates in (r, z) space, relative to (0, base_z)
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translate([0, 0, base_z])
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rotate_extrude(angle=clip_arc, $fn=resolution)
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translate([skirt_inner_radius - clip_lip_depth, 0, 0])
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polygon([
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// Bottom-right: flush with skirt inner wall at base
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[clip_lip_depth, 0],
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// Bottom-right: outer edge (into skirt wall)
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[clip_lip_depth + skirt_wall + eps, 0],
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// Top-right: outer edge at skirt top
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[clip_lip_depth + skirt_wall + eps, skirt_height],
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// Top-left: inner edge of lip at skirt top
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[0, skirt_height],
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// Ramp starts: flush with skirt inner wall
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[clip_lip_depth, skirt_height - spool_rim_thickness]
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]);
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}
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