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


by dkennell, published

MicroMill by dkennell Jan 27, 2013
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This is a 3 axis cnc milling machine that can mill circuit boards as well as aluminum or other soft metals. The software that comes with the planet-cnc controller can generate g-code from dxf or gerber files. The jog pendant allows one to mill manually, with digital readouts of the axis positions on the pc interface.


This mill, like the Pocket Printer, uses the aluminum extrusions as slides. You will need to adjust your printer settings to get a good fit when printing the slides. The exploded drawing and BOM should give you a good idea of how it goes together. I did not include the screws or other hardware, so you will have to figure those things out. This has not been thoroughly tested, but is working well so far. It is very precise and accurate. I use a tool makers vise when milling aluminum, which adds a lot of mass for smoother cutting. I hope this gives others some ideas for other designs.

I have added a folder with all the Inventor files.

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What is the xyz travel?

x 160 mm, y 95 mm, z 90 mm

Is it possible to increase the y length to cover say 6"? I know there are other gantry designs but like you I'll be attaching a dremel so I thought it's best to keep the drill stationary.

I do not think you will have enough strength or stiffness to extend that far, especially for cutting metals.

Yah I was afraid of that. I suppose I'll have to use a gantry design like the Shapeoko or Ord Bot. Do you suppose your printed slide will work well on a gantry? It's rather costly to ship MakerSlide over to my place.

I think they would work.

Thanks. I'll update you when I try it

So the aluminium slides are bought but the platform is printed?

The platform is aluminum, just the ends and support are printed.

Can you post more pictures of the mill itself?

Here are a few more photos. Let me know if you want to see some particular feature.

I've been waiting for this for a while. Glad to see it's done!

In my experience (though some machinists will disagree) the clamps should be made of a soft material that won't destroy your bits when your G code / homing switches / etc. blow up and drive the bit into the clamp. I'd recommend 3D printed plastic.

I finished this last summer, but I wanted to test it and I just never took the time to make the drawings. Your point is well taken, milling is quite different from 3d printing. You can really crash a mill, in fact milling is sort of a controlled crash. When you push a mill into metal, you had better have your speeds and feeds right. The two emergency stops are not an optional feature!

I don't see the emergency stop button in the BOM; could you provide a supplier & part number for it, please?

Here's one place you can find it.

I have witnessed this device in action and WOW!!! It is truly AMAZING!!! The days of buying overpriced circuit boards are over. Way to go on this design. For those who are able to build one, I commend you!

Is there a website for this mill? Or a discussion forum?

What software is used to drive it?

I use the cnc usb controller and software from plantet-cnc.com. Sorry, there is no other website for this machine.