diff --git a/.gitignore b/.gitignore
index b43860a..9e4ef8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,6 @@
 
 # Python
 __pycache__/
+
+# MakerWorld upload package (copies of files already in the repo)
+publish/
diff --git a/print/3mf/sand-table-v3-P1S-options.3mf b/print/3mf/sand-table-v3-P1S-options.3mf
index a3976e7..b199734 100644
Binary files a/print/3mf/sand-table-v3-P1S-options.3mf and b/print/3mf/sand-table-v3-P1S-options.3mf differ
diff --git a/print/3mf/sand-table-v3-P1S.3mf b/print/3mf/sand-table-v3-P1S.3mf
index 1fbdc8f..9341379 100644
Binary files a/print/3mf/sand-table-v3-P1S.3mf and b/print/3mf/sand-table-v3-P1S.3mf differ
diff --git a/print/README.md b/print/README.md
index a9cde8a..a811ef4 100644
--- a/print/README.md
+++ b/print/README.md
@@ -48,8 +48,8 @@ They're built from the STLs by `tools/make_3mf.py` (it needs the Bambu Studio fl
 | 26 slip-ring coupler | `v3` | Bigger, to peg into the collar. |
 | 27 slip-ring holder | `v3` | Screws to the post now. |
 | 30 motor bracket shim | `v3` | Copy of `v2.7/30`. |
-| 31 seam plate low ×4, 32 seam plate high ×4 | `v3` | Flat as modeled, nut slots on top. |
-| 33 seam plug ×16 | `v3` | Flat. |
+| 31 seam plate low ×4, 32 seam plate high ×4 | `v3` | Each file is one plate: print 4 of each. Flat as modeled, nut slots on top. |
+| 33 seam plug ×16 | `v3` | The file is one plug: print 16. Flat. |
 | 34 counterweight | `v3` | Flat, pockets up, no supports. Use 100% infill (or as high as you like): its own weight counts. |
 | 35 counterweight lid | `v3` | Flat. |
 | 36 Uno turnaround plate | `v3` | **Print this.** Turns the Uno around so its USB faces the centre; on the v3 deck it faced the wall with no room for the plug. Flat face on the bed, standoffs up, no supports. See below. |
diff --git a/print/tools/make_3mf.py b/print/tools/make_3mf.py
index 1890d8c..ef688e8 100644
--- a/print/tools/make_3mf.py
+++ b/print/tools/make_3mf.py
@@ -66,9 +66,9 @@ PLATES = [
         ('34-counterweight.stl', 1, None, 1, SOLID),
         ('35-counterweight-lid.stl', 1, None, 1, {}),
         ('36-uno-turnaround-plate.stl', 1, None, 1, {}),
-        ('31-seam-plate-low-x4.stl', 1, None, 4, {}),
-        ('32-seam-plate-high-x4.stl', 1, None, 4, {}),
-        ('33-seam-plug-x16.stl', 1, None, 16, {}),
+        ('31-seam-plate-low-print-4.stl', 1, None, 4, {}),
+        ('32-seam-plate-high-print-4.stl', 1, None, 4, {}),
+        ('33-seam-plug-print-16.stl', 1, None, 16, {}),
     ]),
 ]
 
diff --git a/print/v3/31-seam-plate-low-x4.stl b/print/v3/31-seam-plate-low-print-4.stl
similarity index 100%
rename from print/v3/31-seam-plate-low-x4.stl
rename to print/v3/31-seam-plate-low-print-4.stl
diff --git a/print/v3/32-seam-plate-high-x4.stl b/print/v3/32-seam-plate-high-print-4.stl
similarity index 100%
rename from print/v3/32-seam-plate-high-x4.stl
rename to print/v3/32-seam-plate-high-print-4.stl
diff --git a/print/v3/33-seam-plug-x16.stl b/print/v3/33-seam-plug-print-16.stl
similarity index 100%
rename from print/v3/33-seam-plug-x16.stl
rename to print/v3/33-seam-plug-print-16.stl