diff --git a/tools/sandbox/rhino3dm_error/.gitignore b/tools/sandbox/rhino3dm_error/.gitignore
deleted file mode 100644
index 77320b3..0000000
--- a/tools/sandbox/rhino3dm_error/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-output/*
diff --git a/tools/sandbox/rhino3dm_error/rhino3dm_error.js b/tools/sandbox/rhino3dm_error/rhino3dm_error.js
deleted file mode 100644
index 32cc01a..0000000
--- a/tools/sandbox/rhino3dm_error/rhino3dm_error.js
+++ /dev/null
@@ -1,68 +0,0 @@
-let rhino3dm = require ('../../../libs/rhino3dm.min.js')
-let fs = require ('fs');
-let path = require ('path');
-
-function Open3dmFile (rhino, rhinoFileName)
-{
-	let inputBuffer = fs.readFileSync (rhinoFileName, null).buffer;
-	let inputArray = new Uint8Array (inputBuffer);
-	let inputDoc = rhino.File3dm.fromByteArray (inputArray);
-	return inputDoc;
-}
-
-function GetThreeMeshesFrom3dm (rhino, rhinoFileName)
-{
-	let inputDoc = Open3dmFile (rhino, rhinoFileName);
-	let objects = inputDoc.objects ();
-	let threeMeshes = [];
-	for (let i = 0; i < objects.count; i++) {
-		let mesh = objects.get (i).geometry ();
-		if (mesh instanceof rhino.Mesh) {
-			threeMeshes.push (mesh.toThreejsJSON ());
-		}
-	}
-	return threeMeshes;
-}
-
-function WriteThreeMeshesTo3dm (rhino, threeMeshes, rhinoFileName)
-{
-	let outputDoc = new rhino.File3dm ();
-	for (let i = 0; i < threeMeshes.length; i++) {
-		let rhinoMesh = new rhino.Mesh.createFromThreejsJSON (threeMeshes[i]);
-		outputDoc.objects ().add (rhinoMesh, null);
-	}
-	let writeOptions = new rhino.File3dmWriteOptions ();
-	writeOptions.version = 6;
-	let outputBuffer = outputDoc.toByteArray (writeOptions);
-	fs.writeFileSync (rhinoFileName, outputBuffer);
-}
-
-function ReadWriteRhinoFile (rhinoIn, rhinoOut, inputRhinoFile, outputRhinoFile)
-{
-	let threeMeshes = [];
-	if (inputRhinoFile !== null) {
-		threeMeshes = GetThreeMeshesFrom3dm (rhinoIn, inputRhinoFile);
-	}
-	console.log ('Meshes in ' + outputRhinoFile + ': ' + threeMeshes.length);
-	WriteThreeMeshesTo3dm (rhinoOut, threeMeshes, outputRhinoFile);
-	let reopened = Open3dmFile (rhinoIn, outputRhinoFile);
-	if (reopened !== null) {
-		console.log ('SUCCESS');
-	} else {
-		console.log ('ERROR');
-	}
-}
-
-if (!fs.existsSync ('output')){
-	fs.mkdirSync ('output');
-}
-
-rhino3dm ().then (async function (rhinoIn) {
-	rhino3dm ().then (async function (rhinoOut) {
-		ReadWriteRhinoFile (rhinoIn, rhinoOut, 'input/one_cube.3dm', 'output/one_cube.3dm');
-		ReadWriteRhinoFile (rhinoIn, rhinoOut, 'input/two_cubes.3dm', 'output/two_cubes.3dm');
-		ReadWriteRhinoFile (rhinoIn, rhinoOut, 'input/three_cubes.3dm', 'output/three_cubes.3dm');
-		ReadWriteRhinoFile (rhinoIn, rhinoOut, 'input/one_sphere.3dm', 'output/one_sphere.3dm');
-		ReadWriteRhinoFile (rhinoIn, rhinoOut, null, 'output/empty.3dm');
-	});
-});