Glue your colored whiteboard makers together with duck tape to create a whiteboard pen magazine. If required glue a paper layer around the duck tape to make it non-sticky to the touch. Mark which side is up with an arrow, such that you can always in the same way.

This more than doubled my color-switching speed, fits in my pocket, and takes <5m to make.

It lasts: When a pen is empty just insert a new one. No need to create another magazine. No signs of degradation after multiple hundred unholstering-holstering cycles in total.

FUUU 754 Standard: I am using RFC2119. The magazine MUST be vertically stacked (like shown in the pictures). The magazine SCHOULD have a visual mark, that is clearly visible when the magazine lays on a flat surface, to indicate the top side of the magazine (like shown in the first [...]

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