diff --git a/src/blueprinters/columns.js b/src/blueprinters/columns.js
deleted file mode 100644
index eee7bc8..0000000
--- a/src/blueprinters/columns.js
+++ /dev/null
@@ -1,37 +0,0 @@
-import R from 'ramda'
-import { defaultBlueprint, defaultResource } from '../lib/blueprinters'
-
-/**
- * byColumn - generate a Blueprint from a data sheet by column. Each column
- * name is a resheet, and all values in that column are the resheet items.
- *
- * @param  {type} data - list of lists representing sheet data.
- * @return {type} Blueprint
- * generated.
- */
-function columns (tabName, sheetName, sheetId, data) {
-  // Define Blueprint props
-  const bp = R.clone(defaultBlueprint)
-  bp.sheet = {
-    name: sheetName,
-    id: sheetId
-  }
-  bp.name = tabName
-
-  // column names define resources
-  const labels = data[0]
-  labels.forEach(label => {
-    bp.resources[label] = R.clone(defaultResource)
-  })
-
-  // remaining rows as data
-  data.forEach((row, idx) => {
-    if (idx === 0) return
-    labels.forEach((label, idx) => {
-      bp.resources[label].data.push(row[idx])
-    })
-  })
-  return bp
-}
-
-export default columns
diff --git a/src/blueprinters/deeprows.js b/src/blueprinters/deeprows.js
new file mode 100644
index 0000000..7e00e69
--- /dev/null
+++ b/src/blueprinters/deeprows.js
@@ -0,0 +1,26 @@
+import R from 'ramda'
+import { fmtObj } from '../lib/util'
+
+/**
+ * Each resource item is an object with values labelled according
+ * to column names specified in the sheet's first row. If two or more
+ * column names are the same except for a different integer at the end
+ * (e.g. 'tag1', and 'tag2'), then the values of those two columns are
+ * aggregated into a list, which is the value of the prefix's key ('tag').
+ *
+ * @param  {type} data        list of lists representing sheet data.
+ * @return {type} Array       the structured data.
+ */
+export default (data) => {
+  // TODO: make these deep rows.
+  const itemLabels = data[0]
+  const fmt = fmtObj(itemLabels)
+  const output = []
+
+  data.forEach((row, idx) => {
+    if (idx === 0) return
+    output.push(fmt(row))
+  })
+
+  return output
+}
diff --git a/src/blueprinters/groups.js b/src/blueprinters/groups.js
index 30ef755..9b08ca8 100644
--- a/src/blueprinters/groups.js
+++ b/src/blueprinters/groups.js
@@ -1,39 +1,17 @@
 import R from 'ramda'
 import { fmtObj } from '../lib/util'
-import { defaultBlueprint, defaultResource } from '../lib/blueprinters'
 
 /**
- * groups - generate a Blueprint from a data sheet grouped by a column called 'group'
- * The resource name defaults to 'groups', or a custom resource name can be passed.
  * Each resource item is an object with values labelled according to column
- * names. Items are inserted in the data list at idx = id.
+ * names. Items are inserted into the data list at idx = id.
  *
- * @param  {type} data         list of lists representing sheet data.
- * @param  {type} label="groups"  name of resource in blueprint.
- * @param  {type} name=""      name of blueprint.
- * @return {type} Blueprint
+ * @param  {type} data        list of lists representing sheet data.
+ * @return {type} Array       the structured data.
  */
-export default function groups (
-  tabName,
-  sheetName,
-  sheetId,
-  data,
-  label = 'groups'
-) {
-  // Define Blueprint
-  const bp = R.clone(defaultBlueprint)
-  bp.sheet = {
-    name: sheetName,
-    id: sheetId
-  }
-  bp.name = tabName
-
-  // Column names define resources
+export default (data) => {
   const itemLabels = data[0]
   const fmt = fmtObj(itemLabels)
-  bp.resources[label] = R.clone(defaultResource)
-  bp.resources[label].data = []
-
+  const output = []
   const dataGroups = {}
 
   data.forEach((row, idx) => {
@@ -45,12 +23,14 @@ export default function groups (
       dataGroups[group].push(fmt(row))
     }
   })
-  Object.keys(dataGroups).forEach(groupKey => {
-    bp.resources[label].data.push({
-      group: groupKey,
-      group_label: dataGroups[groupKey][0].group_label,
-      data: dataGroups[groupKey]
+  Object.keys(dataGroups)
+    .forEach(groupKey => {
+      output.push({
+        group: groupKey,
+        group_label: dataGroups[groupKey][0].group_label,
+        data: dataGroups[groupKey]
+      })
     })
-  })
-  return bp
+
+  return output
 }
diff --git a/src/blueprinters/ids.js b/src/blueprinters/ids.js
index 26705b9..9423f8b 100644
--- a/src/blueprinters/ids.js
+++ b/src/blueprinters/ids.js
@@ -1,43 +1,23 @@
 import R from 'ramda'
 import { fmtObj } from '../lib/util'
-import { defaultBlueprint, defaultResource } from '../lib/blueprinters'
 
 /**
- * ids - generate a Blueprint from a data sheet by id, which is an integer.
- * The resource name defaults to 'ids', or a custom resource name can be passed.
- * Each resource item is an object with values labelled according to column
- * names. Items are inserted in the data list at idx = id.
+ * Very similar to the rows blueprinter, but inserts each row as a value in
+ * an object, where the value in the 'id' column of the row will be used as
+ * the search key
  *
- * @param  {type} data         list of lists representing sheet data.
- * @param  {type} label="ids"  name of resource in blueprint.
- * @param  {type} name=""      name of blueprint.
- * @return {type} Blueprint
+ * @param  {type} data        list of lists representing sheet data.
+ * @return {type} Object      the structured data.
  */
-export default function ids (
-  tabName,
-  sheetName,
-  sheetId,
-  data,
-  label = 'ids'
-) {
-  // Define Blueprint
-  const bp = R.clone(defaultBlueprint)
-  bp.sheet = {
-    name: sheetName,
-    id: sheetId
-  }
-  bp.name = tabName
-
-  // Column names define resources
+export default (data) => {
   const itemLabels = data[0]
   const fmt = fmtObj(itemLabels)
-  bp.resources[label] = R.clone(defaultResource)
-  bp.resources[label].data = {}
+  const output = {}
 
   data.forEach((row, idx) => {
     if (idx === 0) return
-    bp.resources[label].data[fmt(row).id] = fmt(row)
+    output[fmt(row).id] = fmt(row)
   })
 
-  return bp
+  return output
 }
diff --git a/src/blueprinters/rows.js b/src/blueprinters/rows.js
index 6966480..f3cf8a2 100644
--- a/src/blueprinters/rows.js
+++ b/src/blueprinters/rows.js
@@ -1,41 +1,22 @@
 import R from 'ramda'
 import { fmtObj } from '../lib/util'
-import { defaultBlueprint, defaultResource } from '../lib/blueprinters'
 
 /**
- * rows - generate a Blueprint from a data sheet by row. The resource name
- * defaults to 'rows', or a custom resource name can be passed. Each resource
- * item is an object with values labelled according to column names.
+ * Each resource item is an object with values labelled according
+ * to column names specified in the sheet's first row.
  *
- * @param  {type} data         list of lists representing sheet data.
- * @param  {type} label="rows" name of resource in blueprint.
- * @param  {type} name=""      name of blueprint.
- * @return {type} Blueprint
+ * @param  {type} data        list of lists representing sheet data.
+ * @return {type} Array       the structured data.
  */
-export default function rows (
-  tabName,
-  sheetName,
-  sheetId,
-  data,
-  label = 'rows'
-) {
-  // Define Blueprint
-  const bp = R.clone(defaultBlueprint)
-  bp.sheet = {
-    name: sheetName,
-    id: sheetId
-  }
-  bp.name = tabName
-
-  // Column names define resources
+export default (data) => {
   const itemLabels = data[0]
   const fmt = fmtObj(itemLabels)
-  bp.resources[label] = R.clone(defaultResource)
-  bp.resources[label].data = []
+  const output = []
 
   data.forEach((row, idx) => {
     if (idx === 0) return
-    bp.resources[label].data.push(fmt(row))
+    output.push(fmt(row))
   })
-  return bp
+
+  return output
 }
diff --git a/src/blueprinters/tree.js b/src/blueprinters/tree.js
index 143d419..5a80cd3 100644
--- a/src/blueprinters/tree.js
+++ b/src/blueprinters/tree.js
@@ -1,36 +1,13 @@
 import R from 'ramda'
-import { defaultBlueprint, defaultResource } from '../lib/blueprinters'
+import { fmtObj } from '../lib/util'
 
 /**
- * tree - generate a Blueprint from a data sheet grouped by a column called 'group'
- * The resource name defaults to 'groups', or a custom resource name can be passed.
- * Each resource item is an object with values labelled according to column
- * names. Items are inserted in the data list at idx = id.
+ * Each resource item is inserted into a tree. TODO: describe layout.
  *
- * @param  {type} data         list of lists representing sheet data.
- * @param  {type} label="groups"  name of resource in blueprint.
- * @param  {type} name=""      name of blueprint.
- * @return {type} Blueprint
+ * @param  {type} data        list of lists representing sheet data.
+ * @return {type} Array       the structured data.
  */
-export default function tree (
-  tabName,
-  sheetName,
-  sheetId,
-  data,
-  label = 'tree'
-) {
-  // Define Blueprint
-  const bp = R.clone(defaultBlueprint)
-  bp.sheet = {
-    name: sheetName,
-    id: sheetId
-  }
-  bp.name = tabName
-
-  // Column names define resources
-  bp.resources[label] = R.clone(defaultResource)
-  bp.resources[label].data = {}
-
+export default (data) => {
   const tree = {
     key: 'tags',
     children: {}
@@ -62,6 +39,5 @@ export default function tree (
     }
   })
 
-  bp.resources[label].data = tree
-  return bp
+  return tree
 }
diff --git a/src/lib/Controller.js b/src/lib/Controller.js
index b9e9351..8433fcd 100644
--- a/src/lib/Controller.js
+++ b/src/lib/Controller.js
@@ -30,6 +30,8 @@ class Controller {
       } else {
         throw new Error(copy.errors.update)
       }
+    }).catch(err => {
+      console.log(err)
     })
   }
 
diff --git a/src/lib/Fetcher.js b/src/lib/Fetcher.js
index 20beca9..f62c79f 100644
--- a/src/lib/Fetcher.js
+++ b/src/lib/Fetcher.js
@@ -91,9 +91,9 @@ class Fetcher {
    */
   _saveViaBlueprinter (tab, data, blueprinter) {
     const saturatedBp = blueprinter(
-      tab,
-      this.sheetName,
       this.sheetId,
+      this.sheetName,
+      tab,
       data
     )
 
diff --git a/src/lib/blueprinters.js b/src/lib/blueprinters.js
index 3dba25d..064922d 100644
--- a/src/lib/blueprinters.js
+++ b/src/lib/blueprinters.js
@@ -24,13 +24,28 @@ export function buildDesaturated (sheetId, sheetName, tab, resource) {
   return bp
 }
 
+const buildBlueprinter = R.curry((datafierName, datafier, sheetId, sheetName, tabName, data) => {
+  console.log(`blueprinter ${datafierName} called: ${tabName}`)
+  const bp = R.clone(defaultBlueprint)
+  bp.sheet = {
+    name: sheetName,
+    id: sheetId
+  }
+  bp.name = tabName
+  bp.resources[datafierName] = R.clone(defaultResource)
+  bp.resources[datafierName].data = datafier(data)
+
+  return bp
+})
+
 // import all default exports from 'blueprinters' folder
 const allBps = {}
 const REL_PATH_TO_BPS = '../blueprinters'
 const normalizedPath = path.join(__dirname, REL_PATH_TO_BPS)
 fs.readdirSync(normalizedPath).forEach(file => {
   const bpName = file.replace('.js', '')
-  allBps[bpName] = require(`${REL_PATH_TO_BPS}/${file}`).default
+  const datafier = require(`${REL_PATH_TO_BPS}/${file}`).default
+  allBps[bpName] = buildBlueprinter(bpName, datafier)
 })
 
 // NB: revert to ES5 'module.exports' required to make blueprinters from