What tools do you need for 3D printing?

The printer’s ordered and you’ve got a basket open with fifteen things in it, because that’s what every tool list for 3D printing looks like. Most of those fifteen are either already coming in the box or for a job you haven’t met yet. Three of them you’ll use on the first print you care about.

What’s already coming in the box

An A1 mini’s accessory box is a scraper blade, two Allen keys, an unclogging pin tool, grease and oil, a spool holder base and some screws. A Prusa arrives with pliers, a screwdriver, hex keys and wrenches, plus the acupuncture needle you’re meant to clear a blocked hotend with.

Notice what both lists have in common: every item keeps the printer running. A printer that stops printing becomes a support ticket, so that’s the box a manufacturer pays to fill. A print with support scars down one side is nobody’s warranty problem, so there’s nothing in there for it. You already own hex keys, a nozzle poker, a scraper and some grease. Buying those twice is the usual first mistake.

The three to buy before your first print finishes

Flush cutters. The flat face of the jaw sits against the part, so the cut lands level with the surface instead of leaving a stub. Use them to chop a support block into sections before you remove any of it, so the force goes into one joint instead of travelling through the whole structure at once. They sort out filament too. Cut the tip to a 45° point before loading, and cut off any blob the last print left on the end, because torn, bent and blobbed ends all jam somewhere between the gears and the hot end.

One flat needle file. One, buying loose — flat does most of the work. A file is rigid, so laid on a surface it can only cut what stands above that surface, and the moment a nub is level it rides on the material around it and stops cutting on its own. That is the whole reason to use a file rather than a knife on a face you want to keep. Taking supports off without leaving marks has the order.

Wet-and-dry paper, or sanding sponges. PLA starts to soften under load at 55°C, so sanding it is a wet job, with the water there to cool it. Friction alone gets you to that temperature dry, and then you’re smearing softened plastic about rather than cutting it. Start around P180 to P320; the grit ladder after that is in taking supports off without leaving marks.

The two to add once you care about the part

A swivel deburring tool. It’s a small blade in a pivoting head that you drag along an edge, taking a thin curl off as it goes. It straddles the corner, so it follows the edge by itself and can’t cut deeper than the edge — one pull does a whole side of elephant foot or the lip round a hole. It is strictly for edges, though. Put it flat on a surface and it’ll gouge, because nothing is holding it level.

Curved tweezers. Long enough to keep your fingers off a nozzle at printing temperature, curved so you reach the purge line without your knuckles going first.

What about the scraper it came with?

A smooth PEI sheet will take a metal spatula, and it will also pick up cosmetic scratches from one, which aren’t covered by warranty, because the sheet is a consumable. The surface is a thin PEI layer on spring steel, so a steel edge driven under a stuck part cuts through to the steel, and that patch never grips properly again.

Two things make the scraper mostly unnecessary. Let the plate cool, since the part contracts more than the steel it’s stuck to and most prints let go once you flex the sheet. And if you print PETG, ASA, ABS or PC Blend, put a glue stick down first, thinly, as a separation layer between the part and the sheet. A glue stick is the cheapest thing on this page and it stops a well-stuck part lifting a piece of the sheet with it.

What to leave in the basket

• Nozzle cleaning needles. You have one, and a blocked nozzle is a month-six problem.
• Digital calipers. Only once you’re printing parts that have to fit something else. Then nothing else will do.
• A heat gun. It does make light stringing shrivel away, but PLA softens from 55°C, so it can quietly ruin the part you’re tidying. Stringing is a retraction problem first.

Safety glasses are the exception, and worth having on day one. Support pieces come off under tension and ping across the room, which sounds overcautious right up until one goes past your face.

Kit or separate tools?

A kit normally works out cheaper than the same tools bought separately, but check the contents, not the number on the front. A “40 piece” kit can be ten nozzle needles, three brushes and a scraper you already own.

So do the sum. Count how many different kinds of tool are in it, then how many pieces are one tool repeated. Mine is 26 pieces and nine kinds of thing, and 15 of the 26 are needle files and spare deburring blades.

Full disclosure: I sell one of these kits. It’s the finishing tools from this page, and it does include two plastic scrapers and a brass nozzle brush, which overlap with what your printer brought — the scrapers deliberately, because plastic won’t score a PEI sheet. There are no nozzle needles, since you’ve got one. Its coarsest sponge is 320-400, so it doesn’t cover the P180 end of the sanding above and you’d want a sheet of that separately. Compare it against whatever else you’re looking at, and if you’ve only run a benchy so far, don’t buy any of this yet.