Build Custom 3D-Printed Fishing Lures and Tackle

Topwater plugs, crankbaits, swimbaits, and jigs are a genuinely good fit for a 3D printer: the shapes are smooth, repeatable, and benefit from the kind of precise weight placement and cavity design that's tedious to carve by hand but trivial to model in CAD. This project walks through designing a printable lure body, adding the hardware that actually makes it fish — hooks, split rings, and a swivel or tow point — and sealing it so it survives being cast, retrieved, and chewed on by fish for more than one trip.

Designing the Lure Body

A few design decisions determine whether a printed lure actually swims correctly rather than just looking like one:

• Action comes from shape, not just paint. A crankbait's diving lip angle and the body's cross-section determine its wobble and dive depth; a topwater popper's concave face is what makes it "pop" on a jerk retrieve. Research or measure a real lure of the type you're copying before freehanding your own geometry.
• Buoyancy and weighting are part of the model, not an afterthought. Design internal cavities for weights (small lead-free fishing weights or BBs, press-fit or epoxied into a printed pocket) positioned to set the lure's float angle and center of gravity. A hollow PLA or resin body alone is often too buoyant for the action you want — weight placement is most of what separates a lure that swims right from one that just floats flat.
• Hardware mounting points need real wall thickness around them. Eye screws, hook hangers, and through-wire anchor points all put repeated cyclic stress on the plastic around them every time a fish hits. Design generous wall thickness and consider a through-wire construction (a bent stainless wire running through the body from nose to tail, anchoring both the tow point and the rear hook hanger) for anything bigger than a small panfish lure — it distributes the load through the wire instead of relying on the plastic alone.

Parts List

• PETG Filament (more water- and impact-resistant than standard PLA for this use)
• Treble Hooks, Assorted Sizes
• Stainless Split Rings, Assorted Sizes
• Screw-In Eye Hook Hangers
• Stainless Steel Wire (for through-wire construction on larger lures)
• Lead-Free Internal Ballast Weights
• 2-Part Clear Epoxy Lure Coating
• Acrylic Craft Paint Set (for airbrushing or hand-painting finishes)
• Airbrush Kit with Compressor (optional, for realistic color patterns)

Printing and Sealing

PETG is generally a better choice than plain PLA for lure bodies — it's tougher, handles the repeated impact of being cast and retrieved better, and tolerates sitting wet in a tackle box without the slow water absorption that can eventually degrade PLA. Print with enough wall thickness and infill density that hook-hanger and tow-point screws have solid material to bite into, not a mostly-hollow shell. FDM-printed parts are not watertight by default — print lines will wick water in over time — so every lure needs a sealing pass: a layer of thin CA glue or dedicated sanding sealer to fill print lines, followed by a full coat of 2-part epoxy lure finish after painting. The epoxy coat is what actually makes it waterproof and durable long-term, not the base print material alone.

Assembly

Install hook hangers and the tow-point eye before the final epoxy coat so the coating seals around their entry points rather than leaving an exposed gap where water can wick in. Attach hooks via split rings rather than directly through a screw eye — split rings let a damaged hook be swapped without re-drilling the body, and they give the trebles the freedom to swing that a rigid connection would kill.

Testing and Tuning

Test every lure in a bathtub, bucket, or shallow water before you trust it on the water: check that it floats at the angle you designed for, that a slow retrieve produces the wobble or action you intended, and that it tracks straight rather than veering to one side (a sign of an off-center tow point or uneven weight placement). It's much easier to drill out and re-glue in a weight at this stage than after you've lost the lure to a snag on its first real cast.

Safety

• Hooks are hooks — handle treble hooks with the same care you would any fishing hardware; needle-nose pliers for attaching split rings keep fingers away from hook points.
• Use lead-free ballast weights where sold-unweighted lures are legal to fish with lead-free tackle requirements (many states and specific waters restrict lead fishing weights) — check your local regulations before choosing ballast material.
• Epoxy and solvent-based sealers need ventilation — cure them in a ventilated area, not sitting on your workbench overnight in a closed room.

Once you've got a hull design that swims right, it's trivial to reprint it in different sizes and color schemes for different species and conditions — the kind of rapid iteration that's exactly what a 3D printer is good for, and a lot cheaper than buying a tackle box full of commercial lures to find the one pattern that works on your local water.