I wanted to make circles more consistently and without the hassle of having to use a circlecompass, The last one tore holes in my pencilcase and was a bit bulky.
So i designed my own! this one has pointy bottom which prevents it from sliding around the paper. You can use it easily with only your finger and a pen. There is an optional second component which helps when making whole circles.
I attached the fusion360 file with it so you can make adjustments to the clearance to make it fit your own pens and markers! :-) You can do this by adjusting the chamfer which I showed in the last picture.
The circles are one centimeter apart, and if i were to modify it later i would either make it more accurate, make more circles diagonally for the 5mm in between, or add a sharper point.
You can print it upside down to overcome the print angle.
The author marked this model as their own original creation.