diff --git a/UrumbotXYZ/fixed_axis/README.md b/UrumbotXYZ/fixed_axis/README.md
index 739833e7a897d3197c6340c500f32727e7f938da..facb1ffaaade66ae0e529312c60dfc73cc2bae04 100644
--- a/UrumbotXYZ/fixed_axis/README.md
+++ b/UrumbotXYZ/fixed_axis/README.md
@@ -81,3 +81,13 @@ This configuration almost works for both PCBs and wax, with dF/dz = 30 N/mm at s
  	- Better string, two strings, belt, leadscrew.
  	- Evaluate bearing design and improve if it makes sense to do so.
  - Measure plate compliance (better word than stiffness?) and increase roller separation to stabilize if it makes sense.
+
+ ###  Evaluating and adding stiffness to z-axis.
+
+ #### Adding more string
+
+  - Confirmed about 30 N/mm stiffness on z axis at the spindle axis.
+  - Measured force and motion with a force sensor attaced to the plate that move the z-spindle, so that little torquing of the bearing was involved.  The result is identical to the spindle measurement, about 30 N/mm, indicating that most of the axis compliance is associated with the belt and motor, rather than the rubber bearings.
+  - Braided three strands together.  Upon reassembling, the stiffness increased by ~20 percent - not significant.  I can see that the motor is turning slightly as force is applied.  Looks like stepper motor torque is the limiting factor.  I will reduce the motor spindle diameter by a factor of three or so.
+
+<img src=./img/braided_braid.jpg width=40%>