Design Requirements

I wanted a case to protect the stylus when moving around, with the option to keep the AAAA battery outside of the stylus in case it leaks when not in use for a long period of time.  I am able to easily remove the nib without the included tool so a spot for the tool wasn't required.

FreeCAD Parameters

The following parameters are adjustable in the included FreeCAD file. 

Stylus Height =143mm
Stylus Diameter =9.5mm
Button Width =4.8mm
Button Height =0.7mm
Button Offset =33mm
Taper Length =9mm
Tip Diameter  =1mm
AAAA Length =42.5mm
AAAA Diameter =8.30mm
Nib Diameter =1.8mm
Nib Length =16.4mm
Nib Tool Diameter =13mm
Nib Tool Height =0.8mm
Tolerance =0.15mm
Wall Width =1.5mm
Cap Overlap =15mm
Chamfer = Stylus_Diameter / 2 - Wall_Width

Print Instructions

I printed in PETG with .4 mm nozzle with variable layer height. I only used infill on the battery slot, but I could have probably gotten away with bridging. The fit was really tight and required some post processing, but it works for me as is so I won't be revisiting it.  

First Impressions

After the cleaning up the print a bit everything seems to fit securely, and nothing moves around when shaken.  It does the job it was designed to do.