diff --git a/src/buildscript.lua b/src/buildscript.lua
index beed809..44a04ad 100644
--- a/src/buildscript.lua
+++ b/src/buildscript.lua
@@ -22,6 +22,15 @@ function buildscript.runWithItem(ms_script, filterExpr)
     end
 end
 
+-- Runs a movescript script, while selecting random items that match a filter.
+function buildscript.runWithRandomItems(ms_script, filterExpr)
+    local instructions = movescript.parse(ms_script)
+    for idx, instruction in pairs(instructions) do
+        itemscript.selectRandomOrWait(filterExpr)
+        movescript.executeInstruction(instruction)
+    end
+end
+
 -- Parses a value for an argument specification from a raw value.
 local function parseArgValue(argSpec, arg)
     if argSpec.required and (not arg or #arg < 1) then
diff --git a/src/itemscript.lua b/src/itemscript.lua
index 18875fa..df621d1 100644
--- a/src/itemscript.lua
+++ b/src/itemscript.lua
@@ -59,7 +59,6 @@ end
 ]]--
 function itemscript.parseFilterExpression(str)
     str = str:gsub("^%s*(.-)%s*$", "%1") -- Trim whitespace from the beginning and end of the string.
-    print("Parsing expr: " .. str)
     
     -- Parse group constructs
     local ignoreRange = nil
@@ -70,7 +69,6 @@ function itemscript.parseFilterExpression(str)
         end
         -- If the group is the whole expression, parse it. Otherwise, defer parsing to later.
         if idx2 == #str then
-            print("Found GROUP")
             return itemscript.parseFilterExpression(string.sub(str, idx1 + 1, idx2 - 1))
         else
             ignoreRange = {idx1, idx2}
@@ -85,7 +83,6 @@ function itemscript.parseFilterExpression(str)
     for _, operator in pairs(logicalGroupOperators) do
         local idx = string.find(str, operator.token)
         if idx ~= nil and (ignoreRange == nil or idx < ignoreRange[1] or idx > ignoreRange[2]) then
-            print("Found " .. operator.name)
             return {
                 type = operator.name,
                 children = {
@@ -108,7 +105,6 @@ function itemscript.parseFilterExpression(str)
     for typeName, token in pairs(arithmeticOperators) do
         local idx = string.find(str, token)
         if idx ~= nil and (ignoreRange == nil or idx < ignoreRange[1] or idx > ignoreRange[2]) then
-            print("Found " .. typeName)
             local subExpr = itemscript.parseFilterExpression(string.sub(str, 1, idx - 1))
             local numberExprIdx1, numberExprIdx2 = string.find(str, "%d+", idx + 1)
             if numberExprIdx1 == nil then
@@ -128,7 +124,6 @@ function itemscript.parseFilterExpression(str)
 
     -- Parse NOT operator.
     if string.sub(str, 1, 1) == "!" then
-        print("Found NOT")
         return {
             type = "NOT",
             expr = itemscript.parseFilterExpression(string.sub(str, 2, -1))
@@ -308,6 +303,15 @@ function itemscript.selectOrWait(filterExpr, minCount)
     end
 end
 
+function itemscript.selectRandomOrWait(filterExpr, minCount)
+    minCount = minCount or 1
+    local filter = itemscript.filterize(filterExpr)
+    while itemscript.totalCount(filter) < minCount do
+        print("Couldn't find at least " .. minCount .. " item(s) matching the filter expression: \"" .. filterExpr .. "\". Please add it.")
+        os.pullEvent("turtle_inventory")
+    end
+end
+
 -- Selects an empty slot.
 function itemscript.selectEmpty()
     for i = 1, 16 do
diff --git a/src/ms-installer.lua b/src/ms-installer.lua
index 4d1e965..3c6df0f 100644
--- a/src/ms-installer.lua
+++ b/src/ms-installer.lua
@@ -11,6 +11,7 @@ local libs = {
 local BASE_URL = "https://andrewlalis.github.io/movescript/scripts/"
 
 print("Running Movescript installer")
+print("----------------------------")
 for _, lib in pairs(libs) do
     if fs.exists(lib) then
         fs.delete(lib)
@@ -23,3 +24,7 @@ for _, lib in pairs(libs) do
     print("Downloaded " .. lib)
 end
 print("Done!")
+for _, lib in pairs(libs) do
+    local m = require(lib)
+    print("  " .. lib .. " installed with version " .. m.VERSION)
+end