Filament diameter tester

by cymon, published

Filament diameter tester by cymon Jul 26, 2012
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ABS filament diameter can change over time. Every once in a while you need to trust if two parts are going to mate propertly. So if you've just changed filament rolls make sure you know what your filament diameter in should be in RepG by printing this small object.

I actually made this to see if I could use it for my chess set, but it has been useful since then too.


Print this object then try mating the two parts together. (PROTIP, name the S3G file with the filament diameter for future reference.)

If when you put the two parts together they're too tight no matter how you push they don't go then raise your filament by 0.04mm.
If they go together with a lot of effort but don't come apart raise your filament diameter by 0.02mm.
If they go together but then fall apart the lower your filament diameter by 0.02mm.
Then repeat the tests until they go together, hold, and come apart with ease. Then use that filament diameter for the rest of your tests.

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Hi Cymon,

Thanks for your awesome prints, hints and tips here and on your blog. What infill do you run this calabration on?

Also, can I ask where the best info can be found re print settings for my replicatorG with 2 x stepstruder mk8's? The makerbot wiki is good for cupcakes and thing-o-matics, but I'
m finding replicator info to be a bit thin on the ground. Thanks again!

Well replicators are still new and untested Territory, so naturally their documentation is a bit thin. That and there is no "best" info yet. We're all still feeling this out. Generally the defaults in ReplicatorG work well enough, by design. Beyond that "fiddling" is effected greatly by environment, so there's no one right answer to every question. I'm trying to collect my thoughts on this in a brief post.. and failing on the brief part. But keep an eye on the blog.

Why not just measure the filament with digital calipers?

Can't afford a fancy digital caliper yet. Soon, tho.

You can get a cheap pair for about 10 bucks (e.g. on ebay), they all do their job well enough for filament measurement.