◆ Soft plastic

Ribbon tail worm lure mold, 6 inch

Six 6 inch ribbon tail worms per pour, the long curly tail that swims on a slow retrieve. A silicone lure mold.

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3D render of the printed caster for a six-cavity silicone ribbon tail worm lure mold beside the silicone mold it pours, with purple soft plastic ribbon tail worms in front
Soft plastic ~68 g

A hand-pour mold for six 6 inch (152 mm) ribbon tail worms: a 90 mm body, ringed behind the head, and a long, thin ribbon tail laid out in a growing S that flutters and swims as soon as the worm moves. Each set of three takes about 13 ml of plastisol.

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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 six-cavity lure mold. Plastisol goes in at 160 to 180 C, which no printed mold survives, and the silicone lets the thin ribbon peel out whole.

The worms are open-pour and flat-backed, as every hand-pour mold makes them. Texas rig one on a 3/0 or 4/0 offset hook, or put it on a Carolina rig and drag it. The zip carries the printed caster exactly as the tool exported it, one set of three 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 junebug purple ribbon tail worms in front, not a photo.

Ribbon tail worm lure mold, 6 inch at a glance: every printed part with its size, print time, filament, print settings and the three steps to use it

What you need

4
  • About 324 ml of mold silicone rated for 200 C (400 F) or more, tin or platinum cure (mix it in one batch)
  • Soft or medium plastisol: about 13 ml fills one set of three ribbon tail worms
  • Plastic lure colour, fine lure glitter and fine salt if you want them
  • A microwave kept for plastisol only, a heat-proof pour cup, gloves and good ventilation

How to cast it

6

  1. Print the caster as exported, open side up, no supports. It only ever holds silicone, never hot plastisol: PLA softens at about 60 C.

  2. Mix 324 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.

  3. Peel the cured silicone out of the caster. That silicone is your lure mold: lay it flat on a heat-proof board.

  4. 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.

  5. Pour each ribbon tail worm from the pour cup in one steady stream, starting at the tip of the ribbon, which cools first, and fill each cavity slightly over the rim. Never pour lead or any metal into this mold.

  6. Let the mold cool for 5 to 10 minutes, then peel each ribbon tail worm out, the thin end first. Trim any flash off the flat back with scissors, and keep the mold for plastisol only.

Print details

2 h 20 minPrint time
~68 gFilament
1Printed parts
164 × 127 × 19 mmSize (W x D x H)
All print details
Print details
Cast materialSoft plastic
Printed parts1
Size (W x D x H)164 x 127 x 19 mm
Print bed needed165 x 128 mm, 19 mm tall
Filament~68 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed caster (STL) + one set of three ribbon tail worms (STL) + tool master (STL) + print and pour sheet
Added2026-09-28
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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.

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Questions about this design

How do I get the whole ribbon tail to fill?

The ribbon is thin, so pour it first: start at the tip of the ribbon with the plastisol at the hot end of its range, run along the tail and finish in the head. A warm mold helps too; the second and later pours of a session fill better than the first.

What plastisol hardness suits a ribbon tail worm?

A soft or medium plastisol: the softer it is, the more the ribbon swims on a slow retrieve. Very soft plastisol tears on the hook sooner, so a medium, or soft with a spoon of hardener, is a good middle for bass worms.

Which colours sell best for ribbon tail worms?

Junebug (purple with green glitter), black with a blue tail, green pumpkin and watermelon red cover most water. Dark colours for stained water and night, translucent greens for clear water. Dip the tail tip in chartreuse dye for a firetail.

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