From c414d77ddbdb425f41bdc5ae2276dcabd77ebe51 Mon Sep 17 00:00:00 2001
From: Sam Hadow <sam.hadow@proton.me>
Date: Thu, 3 Sep 2026 17:03:59 +0200
Subject: [PATCH] parametric seedling tray with pushable plates

---
 seedlings_tray/seedlings-tray.scad | 123 +++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 seedlings_tray/seedlings-tray.scad

diff --git a/seedlings_tray/seedlings-tray.scad b/seedlings_tray/seedlings-tray.scad
new file mode 100644
index 0000000..12a727f
--- /dev/null
+++ b/seedlings_tray/seedlings-tray.scad
@@ -0,0 +1,123 @@
+// ========================================================
+// PARAMETRIC SEEDLING TRAY & PUSHABLE PLATES
+// ========================================================
+
+/* [Grid Configuration] */
+cols = 3;                 // Number of columns
+rows = 2;                 // Number of rows
+cell_size = 35;           // Inner width/length of each square cell (mm)
+tray_height = 50;         // Total height of the tray (mm)
+
+/* [Wall & Ledge Dimensions] */
+wall_thickness = 1.6;     // Thickness of the walls (mm)
+bottom_lip = 4.0;         // Width of the bottom ledge holding the plate (mm)
+floor_thickness = 2.0;    // Thickness of the bottom lip (mm)
+
+/* [Pusher Plate Settings] */
+plate_thickness = 2.0;    // Thickness of the pushable plate (mm)
+clearance = 0.4;          // Gap between cell walls and plate for easy sliding (mm)
+drain_hole_dia = 4.5;     // Diameter of drainage holes in the pushable plate (mm)
+
+/* [Render Mode] */
+// ["both_layout", "assembled", "tray_only", "plates_only"]
+render_mode = "both_layout"; 
+
+
+
+// --- DERIVED CALCULATIONS ---
+pitch = cell_size + wall_thickness;
+total_width  = cols * pitch + wall_thickness;
+total_length = rows * pitch + wall_thickness;
+
+
+// --- MAIN DISPLAY ---
+if (render_mode == "tray_only") {
+    seedling_tray();
+} else if (render_mode == "plates_only") {
+    plate_grid();
+} else if (render_mode == "both_layout") {
+    seedling_tray();
+    translate([0, total_length + 10, 0])
+        plate_grid();
+} else if (render_mode == "assembled") {
+    // Visual preview
+    seedling_tray();
+    for (r = [0 : rows - 1]) {
+        for (c = [0 : cols - 1]) {
+            translate([
+                wall_thickness + c * pitch + clearance/2, 
+                wall_thickness + r * pitch + clearance/2, 
+                floor_thickness
+            ])
+                pusher_plate();
+        }
+    }
+}
+
+
+// ========================================================
+// MODULES
+// ========================================================
+
+// Main seedling tray body
+module seedling_tray() {
+    difference() {
+        // Outer solid volume
+        cube([total_width, total_length, tray_height]);
+
+        // Cut out each cell pocket and bottom push hole
+        for (r = [0 : rows - 1]) {
+            for (c = [0 : cols - 1]) {
+                x_pos = wall_thickness + c * pitch;
+                y_pos = wall_thickness + r * pitch;
+
+                // 1. Main cell compartment
+                translate([x_pos, y_pos, floor_thickness])
+                    cube([cell_size, cell_size, tray_height]);
+
+                // 2. Bottom push-through opening
+                translate([x_pos + bottom_lip, y_pos + bottom_lip, -1])
+                    cube([
+                        cell_size - (2 * bottom_lip), 
+                        cell_size - (2 * bottom_lip), 
+                        floor_thickness + 2
+                    ]);
+            }
+        }
+    }
+}
+
+// Single pushable bottom plate
+module pusher_plate() {
+    p_size = cell_size - clearance;
+    offset_margin = p_size / 3.5;
+
+    difference() {
+        // Plate body
+        cube([p_size, p_size, plate_thickness]);
+
+        // 5-points drainage hole pattern
+        translate([p_size / 2, p_size / 2, -1])
+            cylinder(h = plate_thickness + 2, d = drain_hole_dia, $fn = 20);
+
+        for (dx = [offset_margin, p_size - offset_margin]) {
+            for (dy = [offset_margin, p_size - offset_margin]) {
+                translate([dx, dy, -1])
+                    cylinder(h = plate_thickness + 2, d = drain_hole_dia, $fn = 20);
+            }
+        }
+    }
+}
+
+// Plate grid
+module plate_grid() {
+    p_size = cell_size - clearance;
+    spacing = 2;
+
+    for (r = [0 : rows - 1]) {
+        for (c = [0 : cols - 1]) {
+            translate([c * (p_size + spacing), r * (p_size + spacing), 0])
+                pusher_plate();
+        }
+    }
+}
\ No newline at end of file