Thingiverse
Precision Circle Cutter
por BensHacks
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Circle cutter for paper, cardboard or other thin materials without centre tip. Can also be used to mark an circle on harder, thicker materials.
[Imperial Version](https://www.thingiverse.com/thing:3384499) available!
A fresh segment of an utility knife blade is used for cutting.
The reticle in the base can be seen from three different perspectives from the sides and from the top. This makes aiming at the centre quite easy and precise.
The absence of an centre pin avoids unwanted punctures in the work piece. The base is just pressed down to the material.
A circular groove in the bottom can take a piece of flexible filament (1.75mm) for anti slip. This works great and enables the usage of an quite long arm.
The blade holder can be mirrored to mount the blade between the holder and the base (as shown in the images with the all white background). This sacrifices 15mm of the radius, but makes it safer to use. In this configuration the edge can also be put in the big hole
[Imperial Version](https://www.thingiverse.com/thing:3384499) available!
A fresh segment of an utility knife blade is used for cutting.
The reticle in the base can be seen from three different perspectives from the sides and from the top. This makes aiming at the centre quite easy and precise.
The absence of an centre pin avoids unwanted punctures in the work piece. The base is just pressed down to the material.
A circular groove in the bottom can take a piece of flexible filament (1.75mm) for anti slip. This works great and enables the usage of an quite long arm.
The blade holder can be mirrored to mount the blade between the holder and the base (as shown in the images with the all white background). This sacrifices 15mm of the radius, but makes it safer to use. In this configuration the edge can also be put in the big hole
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