The aim was to design a Centering tool that:

1. had no need for hardware (i.e. was fully printable),
2. was adjustable to make it suitable for various material stock widths,
3. that also included a second function that would make it more versatile.

Other similar printed tools only seem to offer the one of these functions, and a lot of those focused purely on centering are ‘fixed’ and so become cumbersome on smaller stock sizes. Those that do adjust often use metal fasteners requiring tools.

And so this design is the result of my efforts to solve the above and make a great multipurpose tool. I hope you like it!

***Update 12/03/2024***: Imperial version added as many have asked for this, so there are now 2 print profiles to choose from ……“Metric” & "Imperial". I have also taken the opportunity to slightly reposition the number text to better align with the notches which should avoid any confusion when using these.

Function #1 - Centre Marking:

The two knurled shoulder bolts (yep - fully 3D printable) can be screwed into whichever pair of holes best suits the width of material (Note: when spaced at the furthest setting the tool can span a width of 125mm max).

Its then a simple case of sliding the tool along the length of the material with one shoulder bolt over each edge. Tip: apply a slight twisting force to keep the shoulder bolts ‘pinned’ against the sides while you do so.

A pencil / pen can be used to mark through the conical hole, located centrally on the tool, which will prevent your line from wandering out of position. See animation.

Function #2 - Edge Offset Marking:

So this tool also incorporates stepped notches from 5-25mm (at 5mm increments). Allows quick marking out / scribing of measurements in from the edge of your material. This is really common when you are trying to quickly position fixings / pilot drill hole locations etc. See animation.

Perfect for the home, studio, workshop…… Just print, assemble & put to use!