Metric Center Finder with sized inserts

Tool to mark the center line of a board and set distances from the edge
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updated June 2, 2025

Description

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Some people on Thingiverse asked for a metric conversion of a (pretty good) center finder that was made in imperial units. I obliged and did exactly that.

As it also seemed useful to being able to replace the center part both for other drill diameters as well as when they're worn out instead of replacing the whole part, this is a two-part print. There are inserts for drills ranging from 4 to 10 mm and two for pencils, both round and hex-shaped with a diameter/face-to-face distance of 7.25 mm.

The "Baseplate" is 20cm from pin to pin. "Baseplate_small" is sized 10cm.

The offset between two outer or two inner edges is 4mm for the large one and 2mm for the small baseplate, the offset between an outer and an inner edge is 2mm and 1mm respectively.

If the tolerances are off or if you happen to need another drill/pencil diameter, drop a comment.

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Model origin

The author remixed this model.

Center Finder and Offset Tool
by Modelsharing (thingiverse.com)
 

Differences of the remix compared to the original

I mean, calling it a remix is somewhat of a far fetch. I took the initial design as inspiration, but rebuilt it from scratch using metric distances and redesigned the drill holding bit so it can be replaced by different diameters, by a pencil holder or when worn out.

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