Customizable Coin Trap

by mathgrrl, published

Customizable Coin Trap by mathgrrl Dec 1, 2013


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Traps for coins of any size, from any country!

Did you lose a bet? Pay them back with a coin they can never use. Or, did you win a bet? Immortalize your winnings in this trophy bank. Also good for stocking stuffers, little presents, and "first 3D print" jobs to introduce people to 3D printing.

The customizer includes pre-loaded diameters for all major US coins and the top 10 world currencies, as well as the option for entering coin diameters manually. The included STL file includes the entire US cointrap set.

MakerHome, Day 96:


Works well with .2mm layer height.

Insert the coin about 50% of the way through the printing job. If you're brave, you can do this without pausing; watch the pattern that the print head is making for a few cycles before attempting this! Be careful not to let the coin extend into the nozzle area, as this could seriously damage your machine. If you want to be safe then "pause" to insert the coin.


Twitter: twitter.com/mathgrrl
Hacktastic blog: www.mathgrrl.com/hacktastic
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This design and all associated pictures and files are licensed under the Creative Commons Attribution Non-Commercial Share Alike license. If you want to use designs, images, or files outside of the terms of this license, please email [email protected].

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I get the "US_dollar_trap.stl"- File for 50 Euro-Cents .

Functionaly Great ;)

im from denmark and the design fits allmost perfectly with our danish crowns (DKKR)
so great design.

Thank you - I introduced my modern geometry students to OpenSCAD by having them write modules in phases to understand how to model the quarter coin trap. Your blog entry (http://makerhome.blogspot.com/2014/07/day-314-designing-penny-trap-with.html) was very helpful to me when creating the lesson for the class! We will be printing this week and will post photos.

Here's the money I owe you. LOL.

can you write me your printer settings ?
at the half part i got some really ugly layers but i don't know why ?
But big thanks to create this really nice thing !

Hi UlrichMerta,

I usually do these on .3mm/low quality unless they are particularly small (like for dimes). Sometimes I add extra infill, like up to 20% or 30%, to make sure that the columns are sturdy. On certain printers I'll get a weak fault line at the level where I paused the print, so I try to either sneak in the coin without pausing (careful, this can hurt your print or printer or you if you miss!), or else just try to pause well past the halfway mark so that the columns are thicker at the pause.

However I don't get ugly layers other than at the pause layer, so I don't know how to sort that part out. Good luck and thanks for saying thanks :)


I'm a sucker for this for some reason! I gotta find a shiny coin to use! thanks

I owe someone Coke money. Hehehe. A 25mm custom size fits two very shiny quarters quite well. Looking forward to going in to the office now.

Neat idea!

For the insertion, I imagine a pair of needle-nose pliers would help ensure success. :)

Yes, most definitely!