This is a really satisfying fidget toy that's great for anyone who likes spinny objects. Kids love it. If you're not sold from the pictures, watch it in action:

Post-Print Assembly [important!]

Make sure you print one bottom half (with pins) and one top half (with grooves)! This toy won't be very much fun if you can't put it together.

After you pull the print off the plate, line up the pin piece into the groove slot (marked by the outer dots) and press down firmly until the two pieces click together. Then, twist firmly in the direction of the arrows and work it back and forth a little bit. It's tight at first, but I promise it loosens up after a twist or two.

Drop in a coin of your choosing (I recommend Canadian $2 or 2 EUR, but Canadian/American quarters work great too), and you're off to the races.

If you're giving this print to a kid, I strongly recommend you do the first time assembly as it can be very stiff. After that, the mechanism is very smooth and they won't have any issue with it.

The Coin Loop has tight tolerances, but will print fine with most standard print settings in PLA or PETG - if you've tweaked any dimensional compensation settings, then YMMV.

Note: the locking pins are fairly durable, but due to the layer lines, they're sensitive to how good your layer adhesion is. The samples I printed in PLA and PETG had very strong pins that aren't easily broken during typical use, but if you're not printing at the right temperature, the layer adhesion could affect the strength of your pins. Let me know if you have issues with the pins snapping and I'd be happy to help you fix the problem.

Thoughts

Demonstration model in the pictures and video were printed in Bambu PETG Orange. Prints excellent in PLA as well.

I find PETG results in a better print because it's a bit smoother and there's a little less friction. The sound and resonance of PETG is different, too - up to you which you prefer more.

If printed in PLA, the mechanism will loosen up a little bit over time if it's taken apart frequently, but this mostly ends up making it smoother. Because of the design, it's very unlikely that it'll come apart unless intentionally taken apart.

This works with most of the same common coins as my Coin Swoosh. I've tested a variety of Canadian, American, and Euro coins. The Canadian $2 or the 2 Euro coin work best because they're big and heavy, but feel free to try other coinage too.

If you have a coin that doesn't fit that you would like to see work, please ask! I'd be happy to upload a model that works for you.

The mechanisms and design are 100% original creations. I put a lot of effort into designing it to be simple and robust, and hopefully you enjoy it as much as I do!

The idea for this toy came from playing with my other coin model, the Coin Swoosh, which you can find here: https://makerworld.com/en/models/210550#profileId-230356\

Specifications

• Coin Slot Thickness: 2.50mm
  • Determines how thick of a coin you can use
• Coin Diameter Clearance: 28.50mm
  • How much space there is for the coin