Maths cookie cutter set

by mrbenbritton, published

Maths cookie cutter set by mrbenbritton Oct 25, 2012

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You have a set of number cookie cutters at home, you may even have the normal operations + - x /. What is you have an irrational urge to transcend the ordinary and let your imagination take you to the golden cookie!

This is the set for you. It includes some of the most opoular numbers not included in the standard 0-9 set as well as a few of the less common variables and the integral opperator.

The set contains:
e, i, pi, phi, Sigma (big and little), i, sqrt(-1), integral sign.

If you feel I have missed something out I may do requests if you ask nicely and promise to post pictures.


To get all the cutters in one handy lump, download the zip file. It is way down near the bottom of the list and I can't re-order them.

To make a geeky maths cutter, first download your choice of symbol (or download the zip file to get all of them in one handy package) Print it then make cookies.

This site has a great recipe: thehungryhousewife.com/2009/10/sugar-cookie-and-icing-tips.html . Roll thin, cut out, bake and eat. Don't forget to make bad jokes about imaginary cookies!

If you want to create your own cookie cutter you will need:
An image editor that can export to DXF (I use inkscape)

The cookie cutters are generated by the CookieCutter2.scad OpenSCAD script. They use different layers of a DXF to make different parts of the cutter

This becomes the blade of the cutter
This is where you draw things to hold floating sections of the blade (the hole in the 0)
This defines areas to remove the flange from (the hole in the 0)
Not used for this set, see Thing 32431

Have a look at the two SVG files included here for examples of how the layers work.

Create your image and massage all layers into a workable form and save as a DXF (look at repraprip.blogspot.co.nz/2011/05/inkscape-to-openscad-dxf-tutorial.html for instructions)

You will need to edit the CookieCutter2.scad file to open your dxf. Run the script to generate the cutter, it may take 10 minutes or so depending on your machine. Export the STL and start printingyour own cutters. Don't forget to post them here!

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OK - seeing as how you mentioned you might take requests....
(A) I totally agree that infinity is necessary. (I won't say HOW necessary it is.... heh heh heh....)
(B) For the geeks out there (raises hand), you have GOT to make a Tau, if you're going to make a Pi. (There's a cookie / pie joke in there somewhere but I'll leave it to others to fill in the blank....)

Please make a Tau!


How about infinity?

I can't speak for all 3D printers but on the Ormerod forum I follow the 'retract' feature in Slic3r reduces blobs and stringy bits.
From memory a value in the range of 2 to 4 seems to suite most users.
I'm just passing on info here, I'm just starting and learning!

If you have a "creme bruille burner" (hope you understand what I mean) or similar tool with a very hot flame, you can give a short (and here I mean really short gg) heating to the printed object and all the fine hairs are gone ...

Is there any way to get rid of the webs that form? Every time it prints I have to remove the plastic "spider webs" or string that cling on to the walls...

2 things:
(a) you might check your slicer program (e.g. Cura) for the "combing" setting -- it tells the print-head to [move / not-move] across empty areas when it's not actually extruding. For a cookie-cutter, which by definition has lots of empty area, it might help to have the print-head moving over printed (perimeter) areas rather than directly across.
(b) you might also look at your retraction settings. Whenever the head stops printing to move somewhere else, there's a step where it pulls the filament back IN a little before it moves - so there's not a bit of leftover material that it drags along with it to the new 'start printing again' location. There're actually a number of settings related to retraction - like how much is the minimum extrusion before it would retract, whether it does a "Z-hop", etc.... I'm also new at this, but from what I understand, this is all about getting rid of 'stringing'.
Good luck!

I haven't found a way to print without getting the hairs (I print with PLA which is more stringy than ABS). I spend a few minutes with a craft knife to tidy it up.