Low-End Speed Control

Plastics melt at high RPM. A dial that starts near 5,000 RPM lets you cut ABS and PLA cleanly.

Size and Grip

A slim, light body is easier to steer around a small rectangle for a USB-C or display cutout.

Corded or Cordless

Corded tools never run flat on long jobs; cordless ones go where your sensor node is being installed.

Collets and Accessories

Small collets hold tiny PCB drill bits; a wide accessory ecosystem means cutters and burrs are easy to find.

Stands and Attachments

A drill press stand gives straight holes; a flex shaft gives pen-like control for engraving and fine cuts.

The German-designed Proxxon IBS/E is the choice for fine work: drilling 0.8 or 1.0 mm holes in perfboard and PCBs, engraving labels on an enclosure or cleaning up a small display window. It comes with six proper steel collets from 1.0 to 3.2 mm, so tiny carbide PCB drills run true instead of wobbling in a chuck. The 100 W motor with full-wave electronics is notably quiet, the spindle has a lock button for quick bit changes, and the die-cast aluminium head keeps it rigid. It includes 34 bits and cutters in a case. Its top speed is lower than a Dremel’s, which suits plastic and PCB work well.

For removing 3D print supports, sanding the edges of a printed case, opening up a slightly tight USB-C hole or smoothing a cut, a full-size tool is overkill. The Dremel Lite is compact, runs on a built-in 4V lithium-ion battery that charges over USB, and has four speeds from 8,000 to 25,000 RPM. The EZ Twist nose cap changes accessories without a wrench, and it takes Dremel’s standard accessories. It’s built for light-duty work, so don’t expect it to cut metal enclosures.

If you already own Milwaukee M12 drills or drivers, the 2460-20 adds a tough cordless rotary tool for the cost of the bare tool. It runs from 5,000 to 32,000 RPM on a speed dial, weighs 1.3 lb, and has grinder-style exhaust ports and front bearing protection for dusty jobs like cutting aluminium project boxes or DIN rail. It comes with a 1/8 in collet, five cutting wheels, a mandrel and a wrench. The battery and charger are sold separately, and Amazon also lists look-alike “for Milwaukee” tools, so make sure the listing is the genuine Milwaukee one linked here.

If you only open an enclosure now and then, the WEN 2305 is a lot of kit for very little money. The 1.0 A motor runs from 8,000 to 30,000 RPM, it takes 2.3 and 3.2 mm collets, and it includes a flex shaft that gives you pen-like control for engraving and fine cuts, plus an 80-piece accessory set and a case. It’s double insulated. The motor is less powerful and the bearings less refined than the Dremels, and its slowest speed is higher, so go gently on soft plastics.

Hand-held drilling is fine for an enclosure, but holes in a PCB or perfboard need to be straight and exactly where you marked them. The 220-01 turns a Dremel into a small drill press that drills perpendicular holes, or angled ones in 15 degree steps up to 90 degrees. It also works as a flex shaft stand, adjustable from 16 to 29 in. Dremel lists it for the 4300, 4000, 3000, 8240, 8250, 8220, 8260 and older models. It’s an accessory, not a motor, so pair it with the 4300 or 8240.

One tool for everything

The Dremel 4300-5/40.

No cord, full power

The Dremel 8240, or the Milwaukee 2460-20 if you own M12 batteries.

PCB drilling and fine detail

The Proxxon 38481, or any Dremel plus the 220-01.

Finishing 3D prints

The Dremel Lite 7760.

Tight budget

The WEN 2305, or step up to the Dremel 3000.

How do I cut a clean rectangular hole for a USB-C port or display?

Mark the outline with masking tape, drill a small hole in each corner, then cut just inside the lines with a cutting bit at low speed. Finish to the line with a needle file. Cutting slightly undersize and filing to fit gives a much neater result than trying to cut exactly on the line.

Why does my cut melt instead of cutting the plastic?

The speed is too high. Friction heats ABS and PLA past their softening point and the cutter gums up. Drop to the lowest speed that still cuts, use a sharp bit and let the tool do the work without pressing hard.

Is it safe to cut or drill PCBs with a rotary tool?

Yes, with precautions. FR4 board is glass fibre in epoxy, and its fine dust irritates lungs and skin. Wear a dust mask and eye protection, keep a vacuum nozzle near the cut and clean up with a damp cloth rather than blowing the dust around.

Will a metal enclosure hurt my ESP32’s Wi-Fi?

Usually, yes. A closed metal box blocks much of the signal from the onboard PCB antenna. Use a plastic enclosure, cut a plastic-covered window next to the antenna, or use an ESP32 module with a u.FL connector and mount an external antenna through a hole you drill in the case.

Should I print my enclosure instead of cutting a box?

For one-off or oddly shaped projects a printed case with the openings built in is often easier. Ready-made ABS and polycarbonate boxes are tougher and better for outdoor or high-temperature use. Many makers do both, and a rotary tool is useful for finishing either. Our 3D printers for enclosures guide covers the printing side.