This is a tablespoon and teaspoon, suitable for printing and using.
The source file is an OpenSCAD document for outputting a measuring spoon of any desired volume. The measuring spoon consists of a scoop (a half-sphere of desired radius and thickness) connected to a handle (with desired length and thickness). All of these parameters are variables that can be fine tuned to your desire.
If you have never used OpenSCAD before, this is a simple and highly-commented first taste of its usefulness and flexibility.
If you want a simple and easy-to-print teaspoon or tablespoon, just download the right *.stl file and go. If you want to adjust sizes, read on...
MAKE YOUR OWN SIZES
Do you want a two-teaspoon measuring spoon? Three-quarters of a tablespoon? Five milliliters? You only need to adjust the "radius" variable.
To make a measuring spoon of a specific size, you need to first convert that size to milliliters. There are lots of conversion tools to do that. I use ConvertBot on the iPhone. Once you have the volume, in milliliters, convert it to a radius using this formula:
radius (in centimeters) = cube_root((3 volume) / (2 pi))
You will need to shift the decimal point over one spot (that is, multiply by 10) because OpenSCAD uses millimeters. Plug that radius value into the variable named "radius" in this document.
If you want a label, uncomment the "label" variable and point it to a *.dxf file. My printer was unable to handle the detail of the text labels.
I designed this to print on MY particular Cupcake CNC. My printer not only has the older Mark-5 extruder, but suffers from the same extruder motor issues that many others have. It's been hacked with a MOSFET between the extruder controller and extruder, so its accuracy and rate of flow are more of a black art than an exact science.
Because of this, it cannot do detail very well. Your printer might, so I highly encourage you to play around with the scoop thickness and labels. I experimented with 2mm and 3mm thicknesses, but settled on a full half centimeter (5mm) due to quality issues. At 2mm, it mostly printed fine until it got to the apex of the sphere, where there wasn't enough plastic to handle the overhang. There was a lot of drool, resulting in a holy teaspoon. At 3mm, it was thick enough to print an outer and inner shell of the half-sphere, then attempt a solid fill. My extruder spit out too much plastic for the solid fill, which caused mechanical issues during printing (little hills of plastic built up which impeded the print head's motion). 5mm was thick enough for a hollow (honeycomb) fill which allows for a little more slop and a little more margin for extruder error.
I really love the labels, but my hacked Mark-5 extruder just spits out too much plastic for those to work without buildup and, consequently, mechanical errors during printing. I've recently made the handle more wide, so perhaps I can scale up the labels and get a better resulting print.
The source zip file includes the OpenSCAD source code, several .dxf files of labels (1tsp, 1tbl, 1/2tsp, 1/2tbl, 1/4tsp, 1/4tbl, 2tsp) as well as the .eps they came from and the Adobe Illustrator file that generated the PostScript. The source code is heavily commented and should be fairly easy to follow.