D1 refill comparison round 1 tips

Comparison of D1 Refills (Part one)

There are many many pens that take D1 refills, including a couple that I’ve reviewed here and several on Kickstarter. The new Retro 51 Tornado Touch also uses one. A D1 refill, if you don’t know, is a mini refill commonly used in pocket pens or multipens. There are as[…]

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