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+#+TITLE: Test tube cap
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD:
+#+HTML_HEAD:
+#+HTML_HEAD:
+#+HTML_HEAD:
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+[[file:make.png]]
+
+Apparently it is possible to have comparatively tight and well fitting
+test tube cap even from hard (PLA) materials.
+
+[[file:schematic.png]]
+
+Idea is to have outer/entrance radius slightly larger than test tube
+and inner radius slightly smaller. Internal cap radius keeps gradually
+decreasing. This provides tight fit.
+
+
+- Download:
+ - [[file:cap.stl][Printable STL file]]
+ - [[file:cap.FCStd][Editable FreeCAD file]]