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

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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.


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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working a Dremel 3000?

The wikicadmodels link doesn't seem to work. The circle cutter seems to fit my dremmel well. The only thing it needs is threads for the dremmel to be secured well. Forgive me for my ignorance, but what is the slotted extension for on that tool?

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.

Finally tested out the sharpener this last weekend.

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

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.

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"


This might give you a little bit to go on. If you look closely the tool body looks like the cheap, red cordless Dremel wannabes. That's because it is! The main difference is the toenail dust catching attachment, otherwise it's the same device in a different color

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

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.

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.

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!"?

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.

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

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