# STL Viewer: 3D Print & G-code — 3MF, Lithophane, Part Maker

> 3MF, Lithophane, Part Maker (iPhone/iPad app by Sahana A S.)

- Source: https://appshunter.io/ios/app/stl-viewer-3d-print-and-g-code/id6813788641 (this page in markdown: same URL + `.md`)
- Developer: [Sahana A S](https://appshunter.io/developer/1800491118)
- Category: Utilities, Graphics & Design
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 48 MB
- Languages: American English
- Released: 2026-09-23
- Data updated: 2026-10-04
- User reviews in markdown: https://appshunter.io/ios/app/stl-viewer-3d-print-and-g-code/id6813788641/reviews.md

## What is STL Viewer?

Someone sent you a model. It's a 3MF, you're away from your computer, and your phone can't open it. LayerPeek opens it, then tells you what you need to know before you print: will it fit your printer, how many plates it has, and what might go wrong.

It's a 3D model viewer made for printing: an STL file viewer, a 3MF project viewer and a G-code layer viewer in one app.

No account. Your files are read on your device and never uploaded.

OPEN THE FILE YOU WERE SENT
• STL, 3MF, OBJ and G-code files, plus sliced .gcode.3mf projects
• ZIP downloads from model sites: pick the part you want from inside the archive
• Open from Files, iCloud Drive, Mail, AirDrop or a chat app with Open in…
• Large models are simplified for display, while measurements use the full mesh

WILL IT FIT YOUR PRINTER?
Pick your printer once. Every model you open shows whether it fits the bed, with the spare room in millimeters. If it doesn't fit as it sits, LayerPeek checks whether turning it on the bed would make it fit.

3MF PROJECTS, NOT JUST SHAPES
Opens 3MF projects from popular slicers with their plates and filament colors. Switch between plates and see which parts sit on each one.

SLICED FILES: TIME AND GRAMS FROM THE FILE
Sliced .gcode.3mf projects already carry the numbers your slicer calculated. LayerPeek reads the print time, the grams of each filament color and the plate thumbnails straight from the file. Plain .gcode files show the print time and filament use written in their header.

G-CODE LAYER VIEWER
• Drag the scrubber to step through the print layer by layer
• See extrusion and travel moves in different colors
• Print time and filament use, read from the file

MEASURE AND CHECK THE MESH
• Overall dimensions in millimeters
• Tap two points to measure the distance between them
• Mesh health: holes and open edges that can cause slicing trouble
• Overhang shading shows the areas likely to need supports

WEIGHT AND COST ESTIMATE
Choose a material and your price per kilogram. For unsliced models, LayerPeek estimates a typical print (2 walls, 15% infill) and also shows the fully solid weight. Sliced files show the grams your slicer calculated.

MAKE PARTS THAT FIT
Need a part rather than a file? Pick a template, set the sizes in millimeters, see it on your printer's bed and save an STL or 3MF:
• Cases for popular microcontroller and single-board computer boards, built from their published dimensions
• Boxes with dividers, name tags in one or two colors, cable clips, spacers and wall mounts
• Turn a photo into a lithophane, a keychain, a sign or a stamp

SHARE A VERDICT CARD
Turn the result into one image with a picture of the model, the fit check and the key numbers. Send it to a friend, a customer or your print group.

FREE, WITH AN OPTIONAL PRO UPGRADE
LayerPeek is free with ads. Pro removes the ads and unlocks the Pro Make templates, pricing a plate with cost and margin, advanced checks with multiple printers, and more colors in colour pictures.

SUPPORTED FILES
.stl (binary and text) · .3mf · .gcode.3mf · .obj · .gcode · .zip

SUBSCRIPTION AND PRICING
• LayerPeek Pro Lifetime — $9.99, one payment
• LayerPeek Pro Monthly — $1.99 per month, renews automatically
• Payment is charged to your Apple Account at confirmation of purchase
• A subscription renews unless it is cancelled at least 24 hours before the end of the current period
• Manage or cancel anytime in your Apple Account settings

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://cosmovex.web.app/apps/layerpeek/privacy-policy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| LayerPeek Pro Monthly | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| LayerPeek Pro Lifetime | $9.99 | one-time |



## Version history (last 2 releases)

### 1.0.5 — 2026-09-29

What's new in 1.0.5

• The same LayerPeek, easier to find: open STL, 3MF, OBJ and G-code files in 3D
• Check a model fits your printer, with print time, weight and cost
• Make boxes, cases, clips and more in millimeters

### 1.0.4 — 2026-09-23

No release notes.

## Apps similar to STL Viewer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Scan3D-Now](https://appshunter.io/ios/app/scan3d-now/id6812143589) | 5.0 (1) | Free | Utilities |
| [packagenote](https://appshunter.io/ios/app/packagenote/id6798861391) | — | Free | Utilities |
| [Blackpuck Water Monitor](https://appshunter.io/ios/app/blackpuck-water-monitor/id6777945561) | — | Free | Utilities |
| [3D File Converter: STL & 3MF](https://appshunter.io/ios/app/3d-file-converter-stl-and-3mf/id6801810344) | — | Free | Utilities |
| [3D看图大师](https://appshunter.io/ios/app/3d/id6776906757) | — | Free | Utilities |
| [MARC BLINDAGENS](https://appshunter.io/ios/app/marc-blindagens/id1610019653) | — | Free | Utilities |

## More apps by Sahana A S

- [StumpScore](https://appshunter.io/ios/app/stumpscore/id6742899978)
- [WebEva: AI Code & Web Builder](https://appshunter.io/ios/app/webeva-ai-code-and-web-builder/id6744298614)
- [HTML Viewer & Editor - Code](https://appshunter.io/ios/app/html-viewer-and-editor-code/id6759455045)
- [API Client - REST HTTP Tester](https://appshunter.io/ios/app/api-client-rest-http-tester/id6760490589)
- [DevBuddy Dev Tools](https://appshunter.io/ios/app/devbuddy-dev-tools/id6760576492)
- [JSON Viewer and Editor](https://appshunter.io/ios/app/json-viewer-and-editor/id6760624709)

All apps by Sahana A S: https://appshunter.io/developer/1800491118

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-04.*