Day 4: Design Your School Logo Keychain

🎯 Goal

Today you'll turn your school logo into a real, printable keychain — using an online generator to do the heavy lifting. You'll add the keyring hole, export the file, slice it in Bambu Studio, and queue it for print.

  • Find a clean version of your school logo or mascot
  • Upload it to the Keychain Generator and adjust settings
  • Enable the keyring hole so it actually works as a keychain
  • Export the STL and slice it in Bambu Studio
  • Save as 3MF and submit to the print queue

⏱️ Time Guide

StepActivityTime
1Get Your Logo5 min
2Upload to Keychain Generator10 min
3Adjust Settings10 min
4Add the Keyring Hole10 min
5Export STL + Slice15 min
6Save Your File5 min
7Print + Reflect30 min
8Submit5 min
💡 File Types You'll Use Today
🖼️

PNG / JPG

Your logo image

What you upload to the generator

📐

STL

3D model

Exported from the generator

🖨️

3MF

Print-ready file

Saved from Bambu Studio

1

Logo

Find image

2

Generate

Keychain Generator

3

Export

STL file

4

Slice

Bambu Studio

5

Print

Send to printer

📖 How to Use This Page

  • Work through one step at a time — top to bottom
  • Complete every activity before clicking Mark Complete
  • Pause when the teacher asks you to
  • Your progress saves on this device

✅ Success Criteria

  • I found a simple, clean version of my school logo
  • I uploaded it to the Keychain Generator and adjusted the settings
  • My keychain has a working keyring hole (4–6 mm, near the top edge)
  • I exported the STL, sliced it in Bambu Studio, and saved a properly named 3MF file

📚 Day 4 Vocabulary — Keychain Design & Printing

Review these terms before you start. They'll help you understand the steps ahead. 📖 Open Full Glossary

Keychain Generator — A free web tool that turns an uploaded image into a printable 3D keychain model. It automatically creates the base shape, thickness, and optional keyring hole.
Logo Complexity — How many shapes, details, and fine elements a logo has. Simple logos with bold shapes print much better at keychain scale than complex logos with thin lines and small text.
Keyring Hole — The small hole at the top of a keychain that a ring or clip passes through. This must be enabled in the generator. It should be 4–6 mm wide with at least 2 mm of material around it.
Silhouette — The outer outline of a shape or logo when viewed as a solid black form. A strong, recognizable silhouette usually means a logo will print well.
STL — Standard Tessellation Language. The 3D model file exported from the keychain generator. Import it into Bambu Studio to slice.
3MF — The print-ready file format saved from Bambu Studio. It stores your model plus all the slicer settings in one file. You'll save your keychain as a 3MF.
Resolution (Print) — How much detail the printer can reproduce. Fine lines thinner than about 1–2 mm may not print clearly at keychain scale.
Orientation — How your model is positioned on the build plate. Lay the keychain flat (face down) for the strongest result and cleanest surface.
Step 1 of 8 Active 🔍 Get Your Logo
📌 Goal: Find a clean, simple version of your school logo. Simpler is better — the printer can't handle tiny details.
  • Search Google Images for your school logo or mascot
  • Choose the simplest version you can find — bold shapes print cleanly, tiny details don't
  • Download it as PNG or JPG

🆚 Simple vs. Complicated Logos

Not all logos print equally well. Before you pick one, understand the difference:

✅ Simple Logo — Good for Printing
🟢 Bold, thick shapes 🟢 Minimal fine lines 🟢 Clear silhouette 🟢 No tiny text 🟢 Easy to upload to the generator

A simple star, letter, or bold mascot shape will process cleanly in the Keychain Generator, hold up well as a keychain, and print with clear detail.

❌ Complicated Logo — Harder to Print
🔱
🔴 Tiny thin lines 🔴 Small text details 🔴 Complex gradients 🔴 Overlapping shapes 🔴 Hard to process cleanly

A detailed crest with thin lines, small text, and overlapping shapes may not process cleanly in the generator and could lose key details when printed at keychain size.

💡 How to Choose a Logo That Will Print Successfully:
  • Bold shapes win — thick outlines and filled areas process and print clearly at keychain size (40–60 mm)
  • Avoid tiny text — letters smaller than about 5 mm will blur or disappear in the print
  • Fewer shapes = cleaner result — the more separate pieces a logo has, the harder it is for the generator to process
  • Check the silhouette — could you recognize your logo if it was a solid black shape? If yes, it'll probably print well
  • When in doubt, simplify — it's always better to print a clean simple design than a messy complex one
💡 When in doubt, go simpler. Fine lines and tiny text rarely survive the print.
Step 2 of 8 Locked 🌐 Upload to Keychain Generator
📌 Goal: Upload your logo to the Keychain Generator. It will automatically turn your image into a 3D keychain shape — no Tinkercad required for this step.

Step-by-Step

  1. Open the Keychain Generator (https://www.teachingtech.site/3D/keychain)
  2. Click Choose File (or drag your logo onto the upload area)
  3. Select the PNG or JPG you downloaded in Step 1
  4. Wait a moment — the generator will process your image and show a 3D preview
  5. Rotate and zoom the preview to make sure the logo shape looks right
⚠️ Logo not looking right? Try a simpler version of your logo — the generator works best with images that have a clear, solid shape and good contrast between the logo and background.
💡 If the background is white, use a logo with a dark or colored shape. If it's a dark logo on a dark background, download a version with a white or transparent background first.
Step 3 of 8 Locked ⚙️ Adjust Keychain Settings
📌 Goal: Set the size and thickness of your keychain so it's strong enough to use but light enough to carry.

Settings to Check

SettingRecommended ValueWhy It Matters
Width40–60 mmFits well in your hand and on the build plate
Depth / Thickness3–5 mmStrong enough to not snap; light enough to carry
Base layerOn / enabledGives the logo something to sit on; improves durability
💡 Wider isn't always better. At keychain scale (40–60 mm), less detail is more — bold shapes show up cleanly, tiny lines don't.
Step 4 of 8 Locked 🔑 Add the Keyring Hole — Required
⚠️ This step is required. A keychain without a hole is just a charm. You must enable or add a keyring hole before you export. Without it, your design won't be approved to print.

How to Add the Hole

  1. In the Keychain Generator, look for the Hole or Keyring option in the settings panel
  2. Enable it — a circular hole should appear near the top of your keychain in the 3D preview
  3. Check the hole size — it should be 4–6 mm in diameter
  4. Make sure there is at least 2 mm of solid material around the hole — if the walls are too thin, the keychain will snap when a ring is attached
  5. Position the hole near the top edge of the keychain (most generators place it automatically)
💡 Hole Size Guide:
  • Too small (< 3 mm) — A standard keyring won't fit through it
  • Just right (4–6 mm) — Fits a standard keyring; leaves enough material around it for strength
  • Too large (> 8 mm) — Weakens the keychain body; could snap under stress

✅ Hole Check

Step 5 of 8 Locked ⚙️ Export STL + Slice
📌 Goal: Export your keychain from the generator as an STL file, then import it into Bambu Studio to slice it for printing.

Export from the Keychain Generator

  1. Click the Download STL (or Export) button in the generator
  2. Save the file somewhere you can find it — your Desktop or Downloads folder works

In Bambu Studio

  1. Open Bambu Studio
  2. Drag your STL file onto the build plate, or use File → Import → Import 3D Models
  3. Make sure the keychain is lying flat on the build plate (face down) — this gives the strongest result
  4. Select the correct printer profile for the lab printer you're using
  5. Select Bambu PLA Basic as the filament
  6. Click Slice Plate
  7. Open the Preview tab and scroll through the layers — check that the keyring hole is present and the shape looks correct
💡 If the model is on its side, right-click → Lay on Face to flip it flat automatically.
Step 6 of 8 Locked 💾 Save Your File
📌 Goal: Save your 3MF with the right name so the print queue knows it's yours.
  • In Bambu Studio, save your project as a 3MF file
  • File name: LastName_Keychain
✅ Your file should end in .3mf and be named exactly as shown.
Step 7 of 8 Locked 🖨️ Print + Reflect
🖨️ Printing — What to Expect
  • We have 11 printers — you might need to wait for one to open up
  • Waiting is part of the process — use that time to double-check your design
  • Work with Helpdesk to get your file into the queue
  • Do NOT touch other students' prints

✅ Pre-Print Checklist

Confirm all boxes before you submit to the print queue:

💭 Reflection

Step 8 of 8 Locked 📤 Submit Your Work
📌 Instructions: You just built something from scratch — a real keychain with your school's logo. Click Generate My Responses to collect what you wrote today and paste it into your Digital Notebook in Google Classroom.
Optional 🚀 Want to Go Further?
🌟 These workflows are optional. If you finished early, want more control over your design, or just want to go deeper — explore any of these paths. None of them are required to complete today's assignment.

🖼️ Clean Up Your Logo Image

If your logo had a background or looked messy in the generator, try cleaning it up first:

  • Use remove.bg to automatically remove the background from your logo
  • Use Adobe Express to touch up or simplify the image before uploading

🔄 Convert Your Logo to SVG

SVG files give you cleaner outlines and more flexibility in design tools:

  • Go to Adobe Express and sign in with your school Google account
  • Upload your logo and use the background remover if needed
  • Download it as SVG
  • ✅ Your file should end in .svg

🏗️ Build a Custom Keychain in Tinkercad

Want full control over every dimension? Use Tinkercad to build your keychain from scratch:

  1. Open Tinkercad, sign in, and start a new design
  2. Click Import and upload your SVG — scale it to 40–60 mm wide
  3. Set the extrusion height to 3–5 mm
  4. Add a cylinder hole near the top edge (4–5 mm diameter) and group it to cut the hole
  5. Export as STL and import into Bambu Studio