Parametric Corner Trim Edge Guard (L or U Profile)

A simple and fully parametric trim profile generator I created for a personal project. Use it to create a custom-sized L-Shape or U-Shape profile, perfect for finishing the edges of furniture boards, countertops, or as a clean corner guard.

This started from a simple need: I had to neatly finish the raw edge of a woodenish board in my kitchen. Instead of designing one specific size, I decided to create this fully parametric OpenSCAD model. Now, both I and you can generate a perfectly fitting trim for any project in just a few seconds.

The model is designed to be 100% print-ready as soon as you generate it.

Key Features

• Profile Selection: A simple is_u_shape toggle lets you switch between a classic L-profile (2 walls) and a U-channel profile (3 walls).
• Fully Parametric: Adjust the length, the outer dimensions of each leg (A, B, and optionally C), and the overall wall thickness.
• Versatile Application: Ideal for finishing furniture panels (e.g., 18mm boards), countertops, covering gaps, or as simple protective corners.
• 3D Print Optimized: The model is automatically generated lying on its side (flat on the XY plane) for maximum layer adhesion, strength, and easy, support-free printing.

📐 How to Customize

All parameters are available in the "Customise" tab.

• profile_length: The total length of the trim profile (in mm).
• is_u_shape: Toggles the profile shape.
  • false (unchecked) = L-Profile (2 walls).

  • 

  • true (checked) = U-Profile (3 walls).

  • 

• dimension_a: The outer dimension of Wall 'A'.
• dimension_b: The outer dimension of Wall 'B'. (For U-profiles, this is the total outer width of the channel).
• dimension_c: The outer dimension of Wall 'C' (only used if is_u_shape = true).
• wall_thickness: The thickness for all walls of the profile.

🖨️ Print Settings

This is a very straightforward model to print.

• Supports: None required. The model is already pre-oriented to lie flat on the build plate.
• Material: Any standard filament (PLA, PETG, ABS, ASA). For kitchen or utility applications, I recommend PETG or ASA for better durability and moisture/heat resistance.
• Infill: 15-25% is sufficient for most applications.
• Perimeters (Walls): For a stiffer, more robust profile, I recommend using 3-4 perimeters.
• Layer Height: 0.2 mm provides a good balance of speed and quality.

🚀 Like this model?

🖥️ Code

/*
============================================================
==         Generator         ==
============================================================
*/

/*
------------------------------------------------------------
-- User Parameters
------------------------------------------------------------
*/

// 1. Total length of the trim profile in mm
profile_length = 200; // [10:2000]

// 2. Use U-Shape (3 walls)? 
//    (false = L-Shape / 2 walls, true = U-Shape / 3 walls)
is_u_shape = false; // [true, false]

// 3. Outer dimension of Wall 'A' (extends along the Y-axis)
dimension_a = 50; // [5:100]

// 4. Outer dimension of Wall 'B' (extends along the X-axis)
dimension_b = 50; // [5:100]

// 5. Outer dimension of Wall 'C' (extends along Y-axis, parallel to 'A')
//    (Only used if is_u_shape is true)
dimension_c = 50; // [5:100]

// 6. Thickness of all walls in mm
wall_thickness = 2; // [0.5:10]

/*
------------------------------------------------------------
-- Model Generation
------------------------------------------------------------
-- Do not edit below this line
------------------------------------------------------------
*/

// Call the main module to generate the geometry
corner_trim_profile(
   len = profile_length,
   thick = wall_thickness,
   dim_a = dimension_a,
   dim_b = dimension_b,
   dim_c = dimension_c,
   u_shape = is_u_shape
);

/*
------------------------------------------------------------
-- Module Definition
------------------------------------------------------------
*/
module corner_trim_profile(len, thick, dim_a, dim_b, dim_c, u_shape = false) {
   
   // Rotate the entire profile to lay flat on the XY plane
   // (default OpenSCAD Z-axis is "up", so we rotate around X by 90 degrees)
   rotate([90, 0, 0]) {
       
       // Use union() to combine the parts into a single object
       union() {
           
           if (u_shape) {
               
               // --- GENERATE U-SHAPE (3 WALLS) ---
               // Based on total outer width (dim_b) and leg heights (dim_a, dim_c)

               // Wall A (Left Leg, Y-axis)
               // Size: [thickness, height, length]
               cube([thick, dim_a, len]);
               
               // Wall B (Back/Web, X-axis)
               // Positioned between the two legs
               // Size: [width - 2*thickness, thickness, length]
               translate([thick, 0, 0]) {
                   cube([dim_b - (2 * thick), thick, len]);
               }
               
               // Wall C (Right Leg, Y-axis)
               // Positioned at the far right edge
               // Size: [thickness, height, length]
               translate([dim_b - thick, 0, 0]) {
                   cube([thick, dim_c, len]);
               }
               
           } else {
               
               // --- GENERATE L-SHAPE (2 WALLS) ---
               // Based on total outer dimensions (dim_a, dim_b)

               // Wall A (Vertical Leg, Y-axis)
               // Size: [thickness, height, length]
               cube([thick, dim_a, len]);
               
               // Wall B (Horizontal Leg, X-axis)
               // Starts after Wall A and extends to the full dim_b width
               // Size: [width - thickness, thickness, length]
               translate([thick, 0, 0]) {
                   cube([dim_b - thick, thick, len]);
               }
           }
       }
   }
}