Junior forensic lab — 3D-printable model preview

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Science & education Advanced

Junior forensic lab

Dust and match fingerprints and unmask a pen with ink chromatography

Two classic detective techniques in one tray. Dust a glass with cocoa, lift the print with clear tape, stick it on a card and compare it with the ARCH, LOOP and WHORL patterns engraved in the bays. Then solve the mystery note: dot ink from each suspect's black pen near the bottom of coffee-filter strips, hang them from a skewer across the INK trough with their tips in water, and watch each ink split into its own bands of colour. The pen whose colours match the note is the culprit.

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Size (Base A): 200 × 120 × 35 mm
Shape: Rectangular
Walls: 2.4 mm
Volume: 103 cm³
Est. weight (PLA): 128 g
Parts to print: 1
Category: Science & education
Made by: Krypto
Built in: 55 steps

What’s in it

Rectangular, 200 × 120 × 35 mm, with 2.4 mm walls
3 dividers in a grid layout
2 holes in the walls
Engraved and raised text: “ARCH”, “LOOP”, “WHORL”, “INK”
One more base built on (Base B)
Base B: rectangular, 40 × 120 mm, 60 mm tall (beside)

How to print it

Use cocoa or pencil graphite as dusting powder and clear tape to lift prints. Coffee-filter strips work for the chromatography.

Prints as shown on its floor, no supports.

Filament: at most about 128 g of PLA printed solid (roughly $2.55 at $20 per kg); normal infill uses less.

To get the files, open it in the generator and choose File › Download STL (one file per part) or Download 3MF (every part on one plate).

Questions

What size is the junior forensic lab model?

The junior forensic lab model measures 200 × 120 × 35 mm (width × depth × height). That is Base A; one more base is built on. You can change every size in the free SO3D.xyz generator before you download it.

Does it need supports?

No. Use cocoa or pencil graphite as dusting powder and clear tape to lift prints. Coffee-filter strips work for the chromatography. Prints as shown on its floor, no supports.

How much filament does it use?

At most about 128 g of PLA (103 cm³ printed solid), roughly $2.55 of filament at $20 per kg. Normal infill uses less.

Can I change it?

Yes. Open it in the SO3D.xyz generator (free, in your browser), change the size, walls, dividers, holes, text or anything else, then download it as STL or 3MF for your slicer.

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Make it fit your space

Change the size, walls, dividers, holes and labels of the junior forensic lab model in your browser, then download it for your printer. Free, no CAD needed.

Customize this model