# Printing working fasteners with the Machine Screws + Nuts Generator

> ISO-style threaded screws and matching nuts, M2 to M20

Printed fasteners are more useful than they sound: oversized thumb screws for jigs and camera rigs, nylon-style non-marring bolts for clamping delicate work, giant demonstration hardware for teaching, and knobs that thread onto themselves. This generator produces a screw and matching nut as a set, with thread geometry tuned to actually print, and clearance between the pair handled for you.

Presets follow ISO metric proportions from **M2 to M20**, setting nominal diameter, pitch, head across-flats, and nut height in one click. Below M5 printed threads get fragile on standard nozzles, so the sweet spot for working hardware is M6 and up.

## What you need

- Any FDM 3D printer; a 0.4 mm nozzle resolves M6+ threads cleanly
- PETG for working fasteners (tougher threads), PLA for demos and knobs
- Calipers if you are matching an existing tapped hole or bolt

## Step 1 - Pick a preset



Open the tool and select an **M Size Preset** (M2-M20). The preset fills in the nominal **Thread Diameter**, thread pitch, **Head Width** (across flats), **Head Height**, and **Nut Height** to ISO-style proportions. Then set the **Screw Length** for your application.

## Step 2 - Tune fit and feel



- **Nut Clearance** is the gap printed between the screw thread and nut thread. The default scales with diameter and suits a well-tuned printer; if your test nut binds, increase it in 0.05 mm steps.
- **Grip Density** adds knurl-style grip dots to the head, which makes a big difference on thumb screws you tighten by hand.
- Every dimension stays editable after picking a preset, so you can make a low-profile head, an extra-tall nut for soft materials, or a custom in-between diameter.

## Step 3 - Export



Download **STL** or **3MF**. The screw and nut export together, oriented for printing.

## 3D Printing

### Print threads that work



1. Print the screw head-down and the nut flat, exactly as exported; threads print best as vertical helixes.
2. Use 0.12-0.16 mm layers for the thread surface; coarse layers turn threads into ratchets.
3. 3-4 perimeters and 25 percent infill or more; fastener strength lives in the perimeters.
4. Run the nut up and down the screw a few times right off the printer; the first pass burnishes the threads and the fit improves noticeably.
5. If the pair binds, reprint the nut with more Nut Clearance rather than sanding; sanded threads wobble.

## Make it yours

- M8 thumb screws with maximum grip density for camera mounts and jig clamps you adjust constantly.
- An M20 screw-and-nut set as a fidget desk toy; the smooth oversized action is weirdly satisfying.
- Non-marring clamping bolts for woodworking jigs where steel would dent the workpiece.
- A giant cutaway M16 set for teaching thread terminology in a shop class.
- Print nuts in several colors as coded thumb nuts for tool-free panel fasteners.
- Pair with the Standoffs / Spacers Generator and Washer Generator for a complete printed hardware kit in one drawer.
- Custom-length M6 bolts for furniture knock-down fittings when the hardware store is closed.

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Open the 3D Print Machine Screws + Nuts Generator: https://www.mylasertools.com/3d-bolt-nut-generator
Read online: https://www.mylasertools.com/learn/guides/3d-bolt-nut-generator