Instructions

README.md

+Problem:
+
+* The zipper is broken because the sliding part is missing or fatally deformed.
+
+Solution:
+
+1. Open zipper.FCStd in FreeCAD and adjust dimensions as required.
+   There is an extra spreadsheet object which has the thread dimensions.
+   Height only determines the connector rod length, the actual height
+   is determined flexibly during assembly.
+
+2. Print the two parts. It's probably wise not to align the layers parallel
+   to the connector rod. Also good idea to keep the thread-facing sides up
+   so they don't get charred by support attachment.
+
+3. Assemble the two parts around the zipper (press sufficiently hard).
+
+4. Weld the connecting rod at the bottom side with a soldering iron (or other point heat source).
+   Soldering iron at the same temperature as the nozzle during printing is about right.
+
+![The attached part](zipper.jpg "Zipper")