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This stencil will allow you to quickly draw lines on unlined notebook pages.  It's great to use on an unlined notebook and intermix pages for drawing and for writing and/or lists. The stencil has a lip on three sides to help position it quickly and accurately. 

I've uploaded stencil .stl files sized for two different notebook sizes; these are perfectly sized for the standard and larger Field Notes brand notebooks.

I've also included a parameterized Fusion 360 .f3d file, so you can create stencils for other notebook sizes, adjust the line spacing, etc.  You can read more about Fusion 360 parameterization here: https://blog.prusa3d.com/parametric-modeling-in-fusion360_37411/  Try it, it's fun!

Thanks to Tridense for the post-it stencil, and to my girlfriend who had the idea of adapting that stencil to the Field Notes memo books.

Printing Advice

The default .stl files print very nicely with 0.2mm layer height (everything is a multiple of this). I've printed in both PLA and PETG, and using 0.4mm and 0.6mm nozzles, and never had any issues.

Happy printing!