added kevlar prelim info

UrumbotXYZ/fixed_axis/README.md

@@ -95,7 +95,9 @@ This configuration almost works for both PCBs and wax, with dF/dz = 30 N/mm at s
 
 ### Progress as of 4/21/22
 
-#### Replaced loop with direct drive:  Kevlar string wrapped around stepper axle, tension in string opposed by spindle wieght.  PCB traces come out well, using conical bit. This is preliminary - needs more quality time!
+#### Replaced loop with direct drive:
+
+Kevlar string wrapped around stepper axle, tension in string opposed by spindle wieght.  PCB traces come out well, using conical bit. This is preliminary - needs more quality time!
 
 
 <img src=./img/Kevlar_drive.jpg width=40%>