A few tweaks to the Customizable MPCNC Mount for Round Tools produces a Sakura Micron pen holder:
MPCNC – Sakura Pen Holder – Slic3r preview
The pen body seats atop the holder, with its narrower snout inside the clamp, giving positive control of the point position:
MPCNC – Sakura in pen adapter
Unfortunately, should one forget to zero the pen tip to the paper surface before starting a plot, Bad Things happen to good tips:
MPCNC – Sakura pen – crushed tip
The holder really needs at least a few millimeters of compliance, as a fiber-tip pen makes a fairly delicate tool not intended for applying much force at all to anything.
But the holder might make a Z axis probe …
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#1 by Brent on 2018-01-10 - 17:31
Make a parallelogram living hinge :-)
#2 by Ed on 2018-01-11 - 08:42
Exactly like the original pen mount, indeed!