Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Rotary tool accessories

by Chooch, published

Rotary tool accessories by Chooch Jan 30, 2011

Featured Thing!


After looking at the some pricey name brand rotary tool accessories, at the hardware store... I asked myself, what am I doing!? I have an awesome bot that can make these, so I got to designing and here they are.

Circle cutter attachment- Cut large circles that would normally require careful jigsawing or just use it to for doing more controlled cuts. Use a general purpose cutting bit.

Sharpener attachment- Sharpen anything that needs to be sharpened.

Groove/cutting guide- Cut grooves or guide cuts along flats.

*Still working on testing and printing these all out, but in theory it should work.

***2/19/11 Updated circle cutter to rev.1 It Should be able to use bits that are shorter and it's a little less plastic and the file is way smaller.

You can modify the existing cutter if you printed it by cutting off the top right before the screw holes then drill the hole straight though to get rid of the counterbore.

Recent Comments

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I like the derivative! What thread is on it? I never got around to figuring that out and now that I've learned how to model true thread I'd like to make models from now on with thread.

I am working on a derivative:

I haven't forgotten about this I designed something yesterday, just need to finalize and test it out.


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Circle cutter attachment- You'll need an m4 screw & nut, a 624 bearing a M8 rod and four M8 nuts to assemble. For smaller circles use the slot and a screw. Drill a hole in whatever you want to cut put the screw in tighten down with the nut.


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meirm on Sep 26, 2012 said:

I am working on a derivative:

Chooch on Sep 26, 2012 said:

I like the derivative! What thread is on it? I never got around to figuring that out and now that I've learned how to model true thread I'd like to make models from now on with thread.

Chooch on May 9, 2011 said:

Finally tested out the sharpener this last weekend.

I sharpened my lawn mower blades with it and it worked very well.

Anonymous on Feb 25, 2011 said:

You could actually use the dremel attachment for another purpose. You could extend the end, enclose it with a cap, drill a hole on one side and make a nail trimmer for dogs and cats using a drum sander attachment. There are commercially available versions, but making your own is even better.

Chooch on Feb 26, 2011 said:

Yes, I actually thought of this as well...just haven't had a chance to really look at the commercial one yet. I saw it a few months ago at my sister inlaw's house and thought, "hey this is just a dremel tool with a fancy attachment, i could make that"

ScribbleJ on Feb 24, 2011 said:

How does the edge-follower bit work; is the one part deeper than the other so you can hook it over the end of a board or something? I can't quite figure it out from the .STL renders. I know, I'm not too bright. :) I might be wanting to cut some straight slots following an edge with my dremel in the immediate future.

Chooch on Feb 24, 2011 said:

Like so, but I haven't tested it out, yet to see if depth can be set by adjusting the bit or backing off the tool by loosing it. I too need to cut slots soon.

The image is a little old i changed some things, but you get the idea.

woofpickle on Feb 2, 2011 said:

Out of curiosity...Does it really need the bearing? Was there a design stage in there where you tried it and said "Crap, doesn't turn smoothly enough!"?

Chooch on Feb 2, 2011 said:

Yes i did! Smooth and precise that's how I like to cut! j/k

It probably doesn't need a bearing.

I just wanted to make sure the center stays centered in the hole you drill, via a screw/nut combination.

You can easily design your own Center with a nail.

IWorkInPixels on Jan 31, 2011 said:

I don't know why, but at first glance I thought the circle cutter was going to have an exacto blade or something on the outside and the dremel in the middle spinning the entire thing around at ludicrous speed. I was like "Oh, God... the carnage!" :-D

Chooch on Jan 31, 2011 said:

hahahahaa, no I wouldn't intentionally design anything that dangerous.

merlinjim on Jan 31, 2011 said:

Totally awesome.

MarcusWolschon on Jan 31, 2011 said: