diff --git a/inventoryManager.lua b/inventoryManager.lua
index c09a25b..bfc7fdc 100644
--- a/inventoryManager.lua
+++ b/inventoryManager.lua
@@ -148,6 +148,9 @@ local function broadcastState()
         craftTurtleOk   = ctx.craftTurtleName and peripheral.isPresent(ctx.craftTurtleName),
     }
 
+    -- Keep ctx in sync so display.lua can check ctx.craftTurtleOk directly
+    ctx.craftTurtleOk = payload.craftTurtleOk
+
     if state.configDirty then
         payload.smeltable = cfg.SMELTABLE
         payload.craftable = cfg.CRAFTABLE
@@ -505,6 +508,22 @@ local function main()
                     ops.invalidateWrapCache(name)
                     ops.invalidatePeripheralCaches()
                     log.info("DETACH", "%s", name)
+                    if name == ctx.craftTurtleName then
+                        ctx.craftTurtleName = nil
+                        log.warn("DETACH", "Crafting turtle disconnected")
+                    end
+                end
+            end
+        end,
+
+        -- Task 11b: Peripheral attach handler (auto-detect crafting turtle)
+        function()
+            while true do
+                local event, name = os.pullEvent("peripheral_attach")
+                if name and name:match("^turtle_") and not ctx.craftTurtleName then
+                    ctx.craftTurtleName = name
+                    log.info("ATTACH", "Crafting turtle detected: %s", name)
+                    pcall(broadcastState)
                 end
             end
         end,
diff --git a/manager/display.lua b/manager/display.lua
index e2b7eec..97b8aed 100644
--- a/manager/display.lua
+++ b/manager/display.lua
@@ -1141,10 +1141,22 @@ local function buildSmelterPage()
                     local recipeIdx = event.selected.idx
                     local recipe = cfg.CRAFTABLE[recipeIdx]
                     if recipe then
+                        -- Re-scan for turtle if none known
+                        if not ctx.craftTurtleName then
+                            for _, pName in ipairs(peripheral.getNames()) do
+                                if pName:match("^turtle_") then
+                                    ctx.craftTurtleName = pName
+                                    log.info("CRAFT", "Turtle found on re-scan: %s", pName)
+                                    break
+                                end
+                            end
+                        end
                         local turtleOk = ctx.craftTurtleOk
                             or (ctx.craftTurtleName
                                 and peripheral.isPresent(ctx.craftTurtleName))
                         if not turtleOk then
+                            log.warn("CRAFT", "No crafting turtle! (name=%s)",
+                                tostring(ctx.craftTurtleName))
                             self.notification:error("No crafting turtle!")
                             return true
                         end