Here's my take on the obligatory over-engineered CNC pen holder.
CAD screenshot & render vs the final product.
- 2x 85mm lengths of 8mm diameter linear rod
- 2x LM8LUU 8mm long linear bearings (ID 8mm, OD 15mm, 45mm long)
- 2x Springs OD 12mm, 25mm long
- 3x printed parts (download STL files)
- 3x M5 low profile screws
- 2x M5 thumb screws, ends sharpened to a point.
- 3x M5 nuts
- 3x metal washers
- Pens to suit - e.g. BIC Cristal