UV-bead sunscreen tester — 3D-printable model preview

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Science & education Medium

UV-bead sunscreen tester

Prove a sunscreen still works with beads that change colour in sunlight

Is last summer's sunscreen still any good? Fill both dishes with UV colour-change beads, stretch cling film over each, and rub a little sunscreen onto the film over the SPF dish. Put them in the sun: the BARE beads turn bright purple and pink in seconds, while the protected beads stay pale if the sunscreen is working. Try different brands, factors and old bottles, or wipe some off to see why you need to reapply.

Customize this model

Size (Base A): Ø 80 mm, 18 mm tall
Shape: Round
Walls: 2.0 mm
Volume: 36.6 cm³
Est. weight (PLA): 45.4 g
Parts to print: 1
Category: Science & education
Made by: Krypto
Built in: 19 steps

What’s in it

Round, Ø 80 mm, 18 mm tall, with 2.0 mm walls
Engraved text: “BARE”, “SPF”
One more base built on (Base B)
Base B: round, Ø 80 mm, 18 mm tall (beside)

How to print it

Print in white. Fill both dishes with UV colour-change beads and stretch cling film over each.

Prints as shown on its floor, no supports.

Filament: at most about 45.4 g of PLA printed solid (roughly $0.91 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 UV-bead sunscreen tester model?

The UV-bead sunscreen tester model measures Ø 80 mm, 18 mm tall. 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. Print in white. Fill both dishes with UV colour-change beads and stretch cling film over each. Prints as shown on its floor, no supports.

How much filament does it use?

At most about 45.4 g of PLA (36.6 cm³ printed solid), roughly $0.91 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 UV-bead sunscreen tester model in your browser, then download it for your printer. Free, no CAD needed.

Customize this model