◆ Soft plastic
Finesse worm lure mold, 4 inch
Twelve 4 inch finesse worms per pour, ringed with a flat tail, for drop shot and shaky head. A silicone lure mold.
◆ Soft plastic
Twelve 4 inch finesse worms per pour, ringed with a flat tail, for drop shot and shaky head. A silicone lure mold.
A hand-pour mold for twelve 4 inch (102 mm) straight tail finesse worms: a ringed body 8 mm across, a smooth band where a real worm has its egg sack, and a tail that thins and flattens over its last 30 mm so it quivers at the slightest twitch. Each set of six takes about 15 ml of plastisol.
Made with our tray mold generator in its flexible silicone tray mode: print the caster, pour a heat-rated mold silicone into it and peel out a twelve-cavity lure mold. Plastisol goes in at 160 to 180 C, which no printed mold survives, and the thin tails peel out of silicone in one piece.
The worms are open-pour and flat-backed, as every hand-pour mold makes them. Fish them on a drop shot, a shaky head, a Neko rig or a split shot. The zip carries the printed caster exactly as the tool exported it, one set of six worms as an STL, the master uploaded to the tool, and a print and pour sheet with the silicone figure the tool measured.
Shown as a 3D render of the printed caster with the silicone mold it makes and watermelon green finesse worms in front, not a photo.
Print the caster as exported, open side up, no supports. It only ever holds silicone, never hot plastisol: PLA softens at about 60 C.
Mix 254 ml of a mold silicone rated for 200 C (400 F) or more (most tin- and platinum-cure mold silicones are, check the datasheet) and pour it into one corner of the caster in a thin stream until it covers the shapes to the rim. Tap out the bubbles and let it cure for as long as its datasheet says.
Peel the cured silicone out of the caster. That silicone is your lure mold: lay it flat on a heat-proof board.
Heat soft plastisol in a microwave you keep for plastisol only, in 30 to 60 second bursts, stirring between them, until it is clear and runny at 160 to 180 C (320 to 350 F). Stir in colour, glitter or salt now. Work with a window open or under an extractor and wear gloves: hot plastisol burns, and it smokes if it goes past 190 C.
Pour each finesse worm from the pour cup in one steady stream, starting at the head, which cools first, and fill each cavity slightly over the rim. Never pour lead or any metal into this mold.
Let the mold cool for 5 to 10 minutes, then peel each finesse worm out, the thin end first. Trim any flash off the flat back with scissors, and keep the mold for plastisol only.
Print details
| Cast material | Soft plastic |
|---|---|
| Printed parts | 1 |
| Size (W x D x H) | 113 x 160 x 17 mm |
| Print bed needed | 160 x 114 mm, 18 mm tall |
| Filament | ~68 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: printed caster (STL) + one set of six finesse worms (STL) + tool master (STL) + print and pour sheet |
| Added | 2026-09-28 |
Made with the free Tray mold generator. Upload your own model and get the same kind of mold built around it, in your browser.
Free, no account needed. Opens Thingiverse in a new tab.
Free for personal use. Selling the pieces you cast needs a commercial licence (Pro or Founder); passing on the file itself is not permitted on any plan. Full terms.
New to casting? Read the ice cube tray mold guide.
A drop shot, nose hooked on a size 1 or 2 hook, is the favourite for pressured bass and perch. It also works on a 1/8 oz shaky head jig, wacky on a Neko rig with a nail weight in the head, and on a split shot rig in current.
Heat two small batches in different colours. Pour the tail third of every worm with the first colour, then fill the rest with the second while the first is still hot, and they fuse into one worm. Pouring the thin tails first, while the plastisol is hottest, also stops them coming out short.
The plastisol cooled before it reached the thin tail. Heat it to the top of its range (about 175 C), pour the tail end of each cavity first in one steady stream, and warm the silicone mold beforehand with a first throwaway pour or a few minutes on a warm hotplate.
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