March 29, 2026
Description
This is tactical small-size pencil case, contains everything you need to survive geometry/algebra class. There are:
Pen
Pencil
Ruler
Eraser
Some place for every thing you want, from candy for better brain function to cheat sheets if candy still doesn't help
Hardware:
Pen refill (4mm outer diameter)
4mm M2 screw
2x9mm self-tapping screw
Hex pencil (7.5mm bigger diameter)
Round eraser (6mm diameter)
Pen rubber pad (L=27mm, 6mm inner diameter)
Printing:
Print with orientation like on a screenshot with outer brim. Supports are needed only for pen_upper.stl
Post-printing:
Trim 4mm outer diameter pen refill to 60mm
Glue rubber pad to pen_upper
Assemble the pen (thread may need sanding)
Assemble the eraser, using round eraser and 2x9mm self-tapping screw
Trim pencil to 40mm
Assemble the ruler, using the M2 screw
Put the pen to square slot in egg, pencil to the hex slot, eraser to the round slot and ruler to the rectangle slot
Close the egg (thread may need sanding)
License:
Creative Commons — Attribution — Noncommercial