Keyed Heart Gears Keychain

by cymon, published

Keyed Heart Gears Keychain by cymon Jun 30, 2012
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Tired of getting your finger caught in the workings of CrazyJaw's excellent Micro Gear Heart Keychain? I know I was. It's a great thing keep around to show people how cool 3D printed stuff is but it's a bit hard to use. That's why I modified the design and added a key and a place to hold it while you turn. The effect is... effective.

UPDATE Added plates and half plates for the shorter pins. Apparently I was using the longer pins. They worked for me, but were admittedly a bit loose.

UPDATE 2 The new "8" piece (the one at the bottom) did not have enough taken off the bottom so the key would "pop" as it went pass making the turning stiff. If you have already printed one a few cuts with a blade will fix it. If you haven't use the V1.2 files.

Key added and keyless plate for people who want to print the key at 100% infill.


Print a set of pins at 100% infill. (If you have dual extruders you can use the half set and use /thing:24195 to double your output.)

Print the parts with a lower infill if you'd like. You can print the whole set at once using the full plate or just print the new bits to modify your existing Micro Heart Gears Keychain.

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I printed this out. The pins are too large for the holes. The pins are 4.78mm at the pin thickness and the head is at 5.78. The holes vary in thickness at 4.20-4.30. I will probably have to downsize the pins to get them to fit.


And ruin the fun of figuring it out yourself?

The pins were too big to fit in the holes so I scaled them down to 0.9 and they work fine now. The scaling does however render the shorter pins useless as they are now too short to clamp into the pieces but the heart worked fine with the regular pins. I also scaled the key down to 0.9 and it fits better now. Otherwise a brilliant design :)

At this size little differences in 3D printers make big tolerance issues. You might be over-extruding, or maybe I was under extruding. Also, the flexibility of ABS (that I printed this in) vs PLA (that you might have) could also make a difference. 3D printing is more art than science right now.

So are the short pins for making this thing a good tight fit? Because I printed the regular pins and it's way too loose after assembly

Is there any form of instruction on how to assemble this ?

Pins do not fit and it is unbelievably frustrating. I can not figure out how to change filament diameter on a makerbot replicator 2.

is anyone having problems with pins not going in even using a hammer? They just look way too big for the holes :S

Gather around kids, it's time for the filament diameter song: http://www.youtube.com/watch?v=8iwNE6w7r7chttp://www.youtube.com/watch?v...

I have the same issue, I also checked and double checked with a micrometer the size of the filament and made sure the appropriate setting was configured in slic3r. Any other possibilities?

Resolved using these settings with slic3r

Layers and perimeters

Turn off Detect thin walls
Turn off Extra perimeters if needed
Turn on External Perimeters first


Infill before perimeters

Filament Settings

Extrusion Multiplier .9

Hi Cymon,

Nice work with the key and handle, great ideas. I've had an accident with mine and unfortunately the key is now in two bits instead of one. I realise my mistake now, as I only printed the plate at 20% infill to save plastic. Whilst the gears are fine at 20%, the key wasn't and I need to print a
nother. It'd be awesome if I could either grab a source file, or if you could pop up a plate with just the key so it can be printed separately at a higher infill by plastic misers like myself (づ。◕‿‿◕。)づ

Keep it awesome!

I do it 20% infill and it works fine, but yeah, I can break that off for you, no problem.

I use Blender which imports STLs just fine and exports them just fine and doesn't do a real good job of saving history so basically the STLs are the source. But I'll get your key up quickly.

Cool stuff cymoin,

Thanks for the key and for the blender tip. I quickly checked it out and it seems to be just was I was looking for. Cheers!

http://www.thingiverse.com/thing:27928http://www.thingiverse.com/thi... Here's google sketchup file of the key by itself. I managed to import an stl into sketchup, but not the other way round. Any ideas about how to export stl's?

Heart key for cymon's mini geared heart
by taifoid

This is next on my list to print. Looks like a really cool mod!