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Fish Tank Guard Clamps for BJ Harvest Aquaculture

A clear acrylic fish guard for BJ Harvest's farm tanks, held on each rim by 3D printed carbon-fibre PETG clamps we designed.

Client
BJ Harvest Aquaculture
What they got
Printed clamps and curved acrylic panels, ready to fit
How it holds
A hand-tightened screw on the rim, and a latch on each panel
Plan a part for your equipment
Diameter of the round tank the guard was designed for
2,500 mm
The rectangular tank size, also on the order
3,850 x 2,180 mm
From order to ready for collection
Under 7 weeks

What we brought

  1. What we can do

    Designed around your real tanks

    The rims were measured on site, and a prototype clamp was tried on one of BJ Harvest's tanks before production.

  2. How we look after you

    Changes made quickly, before anything is cut

    Four design rounds in under four weeks, each shared with BJ Harvest, from a fixed hook to a screw clamp.

  3. What you get

    Parts made for a wet farm

    Carbon-fibre PETG clamps, steel screws and clear acrylic panels, with no paint to flake into the water.

The build

How we built it

5 steps, from the brief to the finished piece. Pick a step to jump to it.

The brief

Step 1 of 5

Round tank
2,500 mm across
Rectangular tank
3,850 x 2,180 mm
Guard
3 mm clear acrylic
Clamps
3D printed in carbon-fibre PETG

At Additive Inn, our 3D printing studio in Singapore, we designed a fish guard for BJ Harvest Aquaculture: a clear acrylic ring clamped to the rim of their fish tanks. The rims were measured on site first.

Measuring the rim width on site.
Measuring the rim depth.

Design & prototyping

Step 2 of 5

The guard is split into acrylic segments, so the same clamps fit round and rectangular tanks. We advised keeping the water a little lower, so it rarely reaches the printed parts.

  1. First design

    The guard in twelve segments round the rim.

    Render

  2. First design · 09/02/2026

    A fixed PETG-CF bracket hooked under the rim, with no moving parts to wear out.

    Drawing

  3. Screw clamp · 10/02/2026

    A steel screw clamp replaced the hook, so each bracket grips the rim tight.

    Render

  4. Prototype · 20/02/2026

    The first printed clamp, a carbon-fibre PETG arm on a steel screw frame.

    Photo

  5. Final design · 05/03/2026

    After a test fit on one of their tanks, we added a turn latch that holds each panel down.

    PhotoRender +1 more

Production

Step 3 of 5

The clamp arms are 3D printed in matte black carbon-fibre PETG, a stiff plastic suited to wet places. The 3 mm clear acrylic is cut into curved segments, with slots for the clamp tabs.

Curved acrylic segments, still in their film.

Build & assembly

Step 4 of 5

Each printed arm is fitted to its steel screw frame, with a pad on the screw tip and the latch on the arm, then checked and packed with the panels.

Printed arms on their steel frames.

The final build

Step 5 of 5

The clamps and curved acrylic panels were packed for BJ Harvest to collect on 24/03/2026. Each clamp tightens on the rim by its T-handle, and the latch holds its panel.

Three finished clamps.

More product development

See all product development →
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