diff --git a/readme.md b/readme.md
index d9040ca..3aefa56 100644
--- a/readme.md
+++ b/readme.md
@@ -2339,7 +2339,7 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 | `barrel_jack(cutout = false)` | Draw barrel power jack |
 | `block(size, colour, makes_cutout, cutouts)` | Draw a coloured cube to represent a random PCB component |
 | `buzzer(height, diameter, colour)` | Draw PCB buzzer with specified height, diameter and colour |
-| `chip(length, width, thickness, colour, cutout = false)` | Draw a coloured cube to represent a chip, or other rectangular component |
+| `chip(length, width, thickness, colour, cutout = false)` | Draw a coloured cube to represent a chip, or other rectangular component, or cylinder if width is zero |
 | `flat_flex(type, cutout = false)` | Draw flat flexistrip connector as used on RPI0 |
 | `flex(cutout = false)` | Draw flexistrip connector |
 | `hdmi(type, cutout = false)` | Draw HDMI socket |
diff --git a/vitamins/pcb.scad b/vitamins/pcb.scad
index e48ca0f..bb623d4 100644
--- a/vitamins/pcb.scad
+++ b/vitamins/pcb.scad
@@ -88,10 +88,13 @@ module pcb_hole_positions(type, all = true) { // Position children at the hole p
 module pcb_screw_positions(type)  //! Positions children at the mounting hole positions
     pcb_hole_positions(type, false) children();
 
-module chip(length, width, thickness, colour, cutout = false) //! Draw a coloured cube to represent a chip, or other rectangular component
+module chip(length, width, thickness, colour, cutout = false) //! Draw a coloured cube to represent a chip, or other rectangular component, or cylinder if width is zero
     if(!cutout)
         color(colour)
-            translate_z(thickness / 2) cube([length, width, thickness], center = true);
+            if(width)
+                translate_z(thickness / 2) cube([length, width, thickness], center = true);
+            else
+                cylinder(d = length, h = thickness);
 
 module usb_A_tongue() {
     l = 9;