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Tool to find center of a round stock. It was inspired by the StackExchange thread "How to I drill a hole exactly in the center of a circle" where a picture of the inspiring tool is shown.
The design is split into two parts so that it can be layed flat on the printbed.
The split design is a sacrifice made to allow for a metric scale on the top of the part while still allow the part to be printed without overhangs. (I did tried out a "one-part" version which was oriented on the print bed in such a way that there where no overhangs).
This is a major disadvantage when thinking about the square accuracy. To mitigate this issue the tolerance I incorporated is only halve of my usual tolerance in terms of recess between mating surfaces. My usual is a gap of 0.15/0.3mm. This results in 0.075mm gap around the lengthy-rounded alignment protrusion of the snap-fit and a 0.15mm gap for the face which aligns the 45 degree marking edge of the ruler with the main block. The recesses have been incorporated into the main part <b>not</b> into the marker/ruler body.
In regard of improving accuracy I also suggest to glue the parts together and check alignment with an accurate tool (e.g. a triangle ruler from rOtring)
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Note: In regard of the drawback of a two-part design: On the other hand, when comparing the square accuracy of a 3D printer against some metal mill-o-turn CNC thingy the tweak ability of the two-part design ain’t a drawback after all
Link to inspiring…
