Common mechanical pencils come in sizes to accommodate 0.5 ... Thanks to [iliis] for sending in this tip.

An uncommon feature of mechanical pencils is the Kerry’s cap, which resembles those found on fountain pens and lets users ...

This keeps the tip of the writing surface smooth and strong. The plastic pencil is available in a number of different colours, with a transparent case revealing the mechanism within. Mechanical ...

This choice turned out to be very convenient for working around a mechanical issue: the elbow flexes too far in the Z-axis. The difference in pen height between the elbow at 90 vs 180 degrees was ...