3D Printed Jigs and Fixtures: A Practical Guide for Shops
By the 3D Printer on Demand team · Updated July 2026
3D printed jigs and fixtures are custom shop tools that hold a part or guide a tool, built up in plastic layers instead of cut from metal. A jig guides a tool, like a drill or a router. A fixture holds a part still while you work on it. Both used to mean a block of aluminum and a machinist's afternoon. Now you draw one in CAD and have it in hand in days, with no tooling cost at all. This page is the design guide. To order a set, see our jigs and fixtures page.
Jig vs fixture: the simple difference
A jig guides a tool. A fixture holds a part. That is the whole rule.
A drill jig is a block with a hole that points your bit at the exact spot. You push the bit through and it lands right every time. A fixture guides nothing. It just holds the part so it cannot move while you cut, sand, weld, or glue.
Plenty of shop tools do both at once. A printed block can guide a router bit and hold the stock at the same time. Do not get stuck on the label. Decide what the tool has to do, then draw it to do that.
Why shops print jigs instead of machining them
Speed and cost to change. Those are the two reasons, and the second one matters more than people expect.
The old path was a CNC mill, a block of aluminum, and hours of setup. Get the design wrong and you paid for the whole thing twice. With printing you edit the file and run it again. A bad guess costs you a few days, not a machine's schedule.
Custom shape is the other win. Your part is odd, so your fixture has to be odd too. A pocket that cradles a curved part prints just as easily as a flat block. On a mill, that curve is what runs up the bill.
| 3D printed plastic | Machined aluminum | Wood or scrap build | |
|---|---|---|---|
| Cost to start | No tooling cost, pay per part | Machine time plus material | Cheap, but eats shop hours |
| Time to first tool | Ships in 2 to 5 days | Waits on machine time | Same day if someone is free |
| Cost to change it | Edit the file and reprint | Often a full re-cut | Rebuild from scratch |
| Odd or curved shapes | Free, curves cost nothing | Expensive to cut | Hard to do well |
| Wear life | Good, better with a steel insert | Best | Poor, moves with humidity |
| Heat near the work | Up to 140 C with PA-CF | Very high | Burns and scorches |
The jigs and fixtures shops print most
Assembly and production lines are the biggest users. A nest that fits exactly one part puts every unit in the same spot. The work goes faster and every result matches.
These are the ones we see over and over.
- Drill and hole guides that put a hole in the same place on every unit.
- Assembly nests that hold a housing or a board while it gets screwed together.
- Soft jaws in TPU or PETG that grip a finished part without scratching it.
- Go and no-go gauges that check a slot or a boss in one second on the line.
- Router and sanding templates that let a bearing follow a shape.
- Weld and glue-up fixtures that keep two pieces square while they set.
- Bending and forming guides for short runs where a hard tool is overkill.
- Part presenters that hold a unit at the right angle for a photo or a test probe.
How to design a fixture that actually holds
Start with the part, not the tool. Get real measurements off the part you have to hold. A gap of half a millimeter lets the part shift, and a shifting part defeats the whole fixture.
Then locate the part on six points, not on a whole pocket. Three points hold the bottom face. Two more hold one side. One more stops it sliding the last direction. A machinist calls that three-two-one locating. It works because six small contacts always sit flat, while a big flat pocket rocks on whatever high spot it finds.
Clamp against those points, never away from them. A clamp that pushes the part off its locators just moves the error somewhere else.
Add clearance where the part drops in, about 0.2 to 0.4 mm. Plastic prints a touch full, so a pocket drawn at exact size comes out tight. Our tolerances guide has the full clearance table by fit type.
- Cut relief at the inside corners of a pocket. A real part has a radius there, and a square printed corner will not let it seat.
- Leave a finger slot so the operator can lift the part out. A nest with no escape route slows the line down.
- Open a chip and dust path under the part. Debris under a locator is the most common source of a bad hole.
- Print the part number and the revision right into the tool. A shelf full of unmarked black jigs is a shelf nobody trusts.
- Chamfer the lead-in edges so the part drops in without being aimed.
Which material to pick for a printed jig
PETG is the safe default for shop tooling. It is tough, it does not crack easily, and it takes a knock without shattering. Start there and move only when a PETG jig tells you it is not enough.
Two things push you off PETG. Heat near the work, and load that bends the tool.
| Material | Strength | Holds shape to | Use it for |
|---|---|---|---|
| PETG | 50 MPa | 73 C | The default for nests, guides, and templates |
| PA-CF | 80 MPa | 140 C | Jigs under load, near heat, or in daily production |
| ABS | 40 MPa | 98 C | Warm areas and tools you want to paint or color code |
| PLA | 50 MPa | 57 C | Cool, light-duty guides and one-off checks only |
| TPU | 35 MPa | 80 C | Soft jaws and pads that must not mark a finished part |
- PLA is the one to be careful with. At 57 C it can soften next to a hot part, a lamp, or a sunny window in a plant.
- PA-CF costs more and is worth it on a tool that runs every shift. It stays stiff, so the tool keeps holding the same spot.
- TPU is not a fixture body. It is the pad you bond or bolt to one.
Where printed jigs wear out, and what to do
Plastic loses to steel at the point of contact. That is the one honest limit here, and the fix is to stop letting plastic take the wear.
On a drill jig, the bit will chew the hole open over time. Drop a hardened steel drill bushing into the hole and press or glue it in. Now the steel takes the wear and the plastic just holds it in place. The same trick works with a bearing, a dowel pin, or a threaded insert.
Design the wear point as a separate piece when you can. A small insert that bolts on lets you replace the worn face without reprinting the whole tool.
And remember the real advantage. A printed jig is cheap enough to be a consumable. When a tool finally wears out, you print the same file again instead of scheduling a repair. The per-part price steps down at 10, 50, 250, and 1,000, so a shop that keeps spares on the shelf pays less per tool. The tiers are on our pricing page.
Getting your jigs printed without owning a printer
You do not need a printer in the shop. Upload the file, pick a material, and the tools ship to you. That is the fast path when you need working tooling and not a new hobby.
We run FDM in PETG, PLA, ABS, PA-CF, and TPU. PLA and PETG get an instant price on our instant quote page. ABS, PA-CF, and TPU get a fast human quote, and our team replies within four business hours.
Send an STL for the instant price, or a STEP file when a measurement has to be reviewed. Parts ship in 2 to 5 days, made in the USA. If FDM is the wrong process for your tool, we will say so up front instead of forcing a bad fit.
Ordering a full set for a line? Our jigs and fixtures page covers quantities and repeat runs.
Quick takeaways
- A jig guides a tool. A fixture holds a part. Many printed shop tools do both.
- Printing wins on cost to change. Edit the file and reprint instead of re-cutting metal.
- Locate a part on six points, not a big flat pocket. Three on the bottom, two on a side, one on the end.
- Clamp against the locators, never away from them.
- Add 0.2 to 0.4 mm of clearance in pockets, and cut relief at the inside corners.
- PETG is the default. PA-CF at 80 MPa and 140 C is the pick for daily production tooling.
- Let steel take the wear. Press a drill bushing or an insert into the contact point.
Have a part to print? Get an instant price.
Instant QuoteCommon questions
- What is the difference between a jig and a fixture?
- A jig guides a tool, and a fixture holds a part. A drill jig points your bit at the right spot. A fixture holds a part so it cannot move while you work on it. Many 3D printed shop tools do both jobs at once, so what the tool has to do matters more than the label on it.
- Are 3D printed jigs and fixtures strong enough for real shop use?
- Yes, for most shop work, when the material fits the job. PETG at 50 MPa handles everyday holding and guiding without cracking. PA-CF at 80 MPa and 140 C holds up under load and near heat, which is why it suits tooling that runs every shift. For drill jigs, press a steel bushing into the hole so metal takes the wear.
- What material is best for 3D printed jigs and fixtures?
- PETG is the best default, because it is tough and does not crack easily. Move to PA-CF at 80 MPa and 140 C for tools under load or near heat. ABS handles warm areas to about 98 C and takes paint for color coding. Use TPU only for soft jaws and pads. Keep PLA to cool, light-duty guides, since it softens at 57 C.
- How much clearance should a fixture pocket have?
- About 0.2 to 0.4 mm around the part. FDM prints a touch full, so a pocket drawn at exact size comes out too tight to load. Cut relief at the inside corners too. A real part has a radius there, and a square printed corner will not let it seat.
- How long do 3D printed jigs last?
- It depends entirely on what touches them. A nest that only holds a part can run for a long time. A guide that a steel tool rubs against will wear, and that is where the plastic gives out first. Press a hardened bushing or an insert into that one contact point, and design the wear face as a bolt-on piece you can swap.
- Can I get a custom jig printed without owning a 3D printer?
- Yes. Upload a CAD file or an STL, pick a material, and the finished tool ships to you. We print jigs and fixtures with FDM in PETG, PLA, ABS, PA-CF, and TPU, made in the USA, shipping in 2 to 5 days. PLA and PETG price instantly, and the other three get a human quote within four business hours.
- Is a printed fixture cheaper than a machined one?
- Usually, and the gap is widest on odd shapes and small quantities. There is no tooling cost, curves cost the same as flats, and a design change is a reprint instead of a re-cut. Machined aluminum still wins on wear life and on very high heat. So the honest answer is to print the tool and let steel handle the contact points.