Drilling a hole in a scale model sounds simple until the bit wanders off the mark, the plastic melts around it or a 0.5 mm bit snaps inside the part. Most of those failures come from the wrong drill for the job, or from speed and pressure that were too high. The real question is which tool: a manual pin vise, a refined hand drill or a small electric drill. This guide compares the ones we carry, shows where each wins, and gives the drilling technique that matters more than the tool.
If you want a deeper dive on the bits themselves, see our micro drill bits guide. This article is about the drill that holds them and how to use it.
Why hole drilling matters in modeling
Drilling shows up everywhere in the hobby:
- Opening gun barrels and exhaust pipes so they look hollow.
- Pinning parts with brass rod for strong joints.
- Adding rivet or bolt holes and photo-etch mounts.
- Creating rigging and wiring points.
- Cleaning and opening up 3D printed parts.
Every one of these needs a clean, round hole in the right place, and small bits are fragile. Control matters more than power. Our rule of thumb: if you can feel the bit cutting, you are in control; the moment you stop feeling it, you are one slip away from a broken bit or a melted hole.
Pin vise vs electric drill at a glance
| Tool | How it turns | Speed | Bits it takes | Best for |
|---|---|---|---|---|
| UStar pin vise set | Fingers | As slow as you like | Comes with 10 bits, 0.4 to 1.3 mm | First drill, thin plastic, tiny bits |
| DSPIAE Mobius hand drill | Fingers, ball bearings | As slow as you like | DSPIAE spin-lock bits | Frequent hand drilling, less fatigue |
| DSPIAE Orbit | Electric or manual mode | Fixed 240 RPM, forward and reverse | 3.175 mm shank, spin-lock bits | Many holes, resin, 3D prints |
| USB mini drill | Electric or manual mode | Five speeds, 3000 to 15000 RPM | Interchangeable chucks, 1 to 3.2 mm | One multi-tool: drill, sand, cut |
The short version: for fine hand-feel on thin plastic, a pin vise or hand drill wins. For a lot of holes in resin, printed parts or metal, electric saves your fingers. The two electric options are very different tools, and the speed gap between them is the most important thing to understand.
Option 1: The classic pin vise
A pin vise is a hand drill that spins between your fingers. Because you feel the bite directly, it is the safest way to start a hole in thin plastic or resin, and there is no speed to get wrong: friction heat stays low because you control every turn. The UStar precision pin vise set has a quick-change chuck that swaps bits with a twist and an anti-slip textured grip. It includes 10 bits from 0.4 mm to 1.3 mm and a balanced metal body suited to plastic, resin and soft metal.
Our pick for a first drill. It covers pin holes, rivets and rod work, and the skills you learn with it (steady pressure, straight alignment) carry over to every other drill.
Best for: starting holes, very small bits, delicate parts and anyone buying their first drill.
Option 2: A refined hand drill
The DSPIAE Mobius hand drill is still manual but upgrades what a pin vise can do. Its anti-slip oval-slot chuck pairs with DSPIAE spin-lock bits for a mechanical lock that minimizes slipping and wobble. The body is CNC-machined aluminum with dual-precision ball bearings for smooth rotation, a spiral ergonomic grip, and a magnetic tail cap for storing bits. The bearings and the locked bit make it steadier than a basic pin vise, which matters when you open dozens of holes in one session.
The matching DSPIAE spin-lock drill bits are made from tungsten steel and compatible with both the Mobius and the Orbit drills. Choose your sizes from the size dropdown.
Best for: builders who drill often and want less hand fatigue and more bit security.
Option 3: Electric hand drills
High-speed rotary tools are famous for melting plastic and snapping micro bits. Hobby electric drills reduce that risk, but they are not all equal, and speed is where they differ most.
DSPIAE Orbit electric hand drill
The Orbit runs at a fixed 240 RPM with 1200 gf-cm of torque, and its concentricity is rated at 0.05 mm or less, which means rounder holes and a lower risk of breaking micro bits. It has an electric mode and a manual pin-vise-style mode, forward and reverse rotation, and a built-in battery with up to 120 minutes of no-load runtime. The slim aluminum body is 18 mm in diameter and 110 mm long and weighs about 45 g. It takes bits with a 3.175 mm shank and works with the spin-lock bits. Drill bits are not included in the basic set.
At 240 RPM it is slow enough that styrene has time to shed heat, which is why it suits resin, 3D prints and plastic.
USB rechargeable mini electric drill
The USB rechargeable mini drill works as a manual pin vise or in electric mode, with five speeds from 3000 to 15000 RPM. A lithium battery charges by USB in under 2 hours for up to 90 minutes of use. Depending on the set, it comes with a carrying case and accessories such as drill bits, sanding bands, cutting disks, sawblades, felt wheels and five chucks sized 1 to 3.2 mm. It is the more versatile choice if you want one tool for drilling, sanding and cutting.
Important speed warning. Even the lowest setting of this mini drill (3000 RPM) is more than ten times the Orbit's fixed 240 RPM. At that speed a fine bit can heat styrene enough to soften and smear it. On plastic, use the lowest speed in short bursts, lift the bit often to clear swarf and let the part cool. Save the higher speeds for resin, soft metal and rigid materials, or use the tool in manual pin-vise mode for the first millimeter of any hole in thin plastic.
Best for: repeated drilling, resin and 3D prints, opening many holes, or when your hand tires.
Which one should you buy?
- First drill, occasional use: the pin vise set.
- Frequent drilling with tiny bits: Mobius hand drill with spin-lock bits.
- Many holes in plastic, 3D prints and resin, with a gentle feel: the Orbit, for its low fixed speed and runtime.
- One multi-tool for the bench: the USB mini drill with accessories, used at its lowest speed on plastic.
If you only ever buy one, buy the pin vise. Even with a powered drill on the bench, a pin vise stays useful, because for the first few turns of a hole nothing beats your own fingers.
How to drill a clean hole, step by step
The tool matters less than these habits. They apply to every drill above.
1. Prepare and secure the part
Trim the sprue stub flush first (our nipper guide explains the two-cut method) so the part sits flat. Then hold it firmly: clamp it, press it on a cutting mat, or hold it in a small vise such as the Stedi MS-206 handheld split bench vise, which holds small parts and has a ball joint so you can tilt the part until the hole axis is vertical. Never hold a small part in your fingers right where the bit will exit.
2. Mark the spot first
A bit is round and the surface is not, so a bit placed on a plain surface will skate. Press the tip of a sewing needle or the point of a hobby knife lightly into the exact spot to make a tiny dimple, then set the bit's tip into that dimple. For holes at the exact center of round or square parts, the drilling guide center locator has semi-circles of different diameters. Match one to your part, hold it with adhesive tape and drill through the central hole. The other side has squares for square parts. This is the easiest way to center a barrel or exhaust tip.
3. Start small, step up
Begin with a pilot hole at the smallest size, then go up in size rather than forcing one large bit through. For a hollow barrel, a 0.8 mm pilot followed by 1.0 mm and then the final size gives a cleaner, rounder wall than a single pass.
4. Drill straight
Perpendicular is the hard part. Look at the bit from the front and from the side, then check again after the first millimeter. If the bit leans, stop and correct it now; once the flutes are cut into a slanted hole you cannot straighten it. Resting your elbow on the bench and turning the tool with one hand while the other holds the part steady helps keep the axis fixed.
5. Light pressure, clear the swarf
Let the bit cut and do not lean on it. Back out every couple of millimeters to clear plastic swarf, because packed flutes jam and heat the hole. If you see the plastic turn glossy or smear, the bit is too hot or too dull: stop, let it cool and clear it.
6. Set a depth stop
For pin holes, wrap a small flag of masking tape around the bit at the depth you want. When the tape touches the part, stop. It prevents breaking through the visible surface, and for pinning it keeps both holes equally deep so parts meet cleanly. A pin about 1 mm shorter than the combined depth leaves room for glue.
7. Clean up
Remove burrs around the hole with the tip of a hobby knife or a rolled piece of sandpaper. For resin and printed parts, wear a dust mask when drilling for long sessions and wash your hands after; our mold line guide covers the finishing steps and the cautions for metal and resin.
Wear eye protection whenever you use an electric drill. A snapped micro bit can fly.
Choose carbide for hard jobs
The carbide micro drill bits come in single diameters from 0.1 to 1.2 mm, graduated sets (0.1 to 1.0 mm, 0.3 to 1.2 mm and 1.1 to 2.0 mm), or an all-in-one set of 20 bits covering 0.1 to 2.0 mm. The hard carbide tips hold a sharp edge longer than standard steel, which helps in resin and metal, and they fit common pin vises and rotary tools with a compatible collet. Carbide is brittle: it snaps if you flex it sideways, so use steady, straight pressure and never lever or wobble the bit.
Check the shank
The Orbit takes 3.175 mm shanks and the DSPIAE drills use spin-lock bits. Make sure your bits match your chuck before buying, and use a chuck size that grips the shank fully.
Common mistakes
- Skipping the mark. Without a dimple the bit walks, and a walked bit ruins detail.
- Too much speed on plastic. Slow is safer; if it smears, you are too fast or too hot.
- Leaning on the bit. Pressure snaps micro bits; let it cut.
- Drilling at an angle. Check two directions before you commit.
- Holding the part by the exit side. Clamp it instead.
FAQ
Will an electric drill melt my plastic kit?
It can, if the speed is too high. The Orbit runs at a fixed 240 RPM, which is gentle on plastic. The USB mini drill starts at 3000 RPM even on its lowest setting, so use short bursts, lift often and consider starting the hole by hand.
Can I use the same bits in every drill?
Not always. Spin-lock bits are for the DSPIAE drills, the Orbit uses 3.175 mm shanks, and carbide micro bits need a pin vise or rotary tool with a compatible collet.
Do I need an electric drill if I have a pin vise?
No. A pin vise handles most jobs. Electric drills make sense when you drill many holes or work with resin and printed parts.
How do I keep a bit from wandering?
Press a needle point into the spot first to make a small dimple, start with a small pilot bit and use light pressure.
How do I drill to the same depth every time?
Wrap a small flag of masking tape around the bit at the depth you want and stop when it touches the part.