◆ Resin

Resin keychain mold, 6 shapes

Six resin keychain blanks in one pour: heart, circle, star, dog tag, oval and arch. Each has its hole.

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3D render of the printed caster for a six-shape resin keychain mold, with pink resin heart, circle, star, dog tag, oval and arch keychain blanks in front
Resin ~80 g

A silicone mold for six different resin keychain blanks, each 5.5 mm thick: a 50 mm heart, a 48 mm circle, a 51 mm star, a 30 x 52 mm dog tag, a 34 x 50 mm oval and a 36 x 52 mm arch. A small post in every cavity leaves a 3.8 mm hole for a jump ring, so there is nothing to drill.

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Made with our tray mold generator in its flexible silicone tray mode: print the caster, pour silicone into it and peel out a flexible six-shape keychain mold. Resin lets go of silicone with a gloss and needs no release agent, and the tray peels off the blanks instead of pulling them out.

Blanks are what resin keychains are built on: glitter, mica swirls, dried flowers, a photo or a vinyl name. The whole set takes about 48 ml of resin. The zip carries the printed caster exactly as the tool exported it, the set of six blanks on its own 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 a set of six pink resin blanks in front, not a photo.

Resin keychain mold, 6 shapes 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 195 ml of silicone, ideally platinum (mix it in one batch)
  • About 48 ml of epoxy casting resin for all six, or UV resin
  • Glitter, mica, alcohol ink or dried flowers
  • Jump rings (6 to 8 mm), key rings and a heat gun or lighter for bubbles

How to cast it

5

  1. Print the caster as exported, open side up, no supports. For glassy blanks, print with ironing on the top surfaces, or sand the raised shapes smooth and brush on XTC-3D: the silicone copies every layer line and resin shows it.

  2. Mix 195 ml of silicone, ideally a platinum one, 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, let it cure and peel it out. Each cavity has a small post that leaves the key ring hole.

  3. Mix epoxy casting resin at the ratio on the bottle, stir slowly for three minutes and let it rest a few minutes so the bubbles rise. Glitter, mica or dried flowers go in face down: the side against the silicone is the front.

  4. Fill each cavity to just below the top of its post (all six blanks take about 48 ml together) so the hole stays open, and pass a heat gun or a lighter quickly over the surface to pop the bubbles. Cover the tray against dust.

  5. Leave epoxy 24 hours, then flex the tray and peel it off the blanks rather than pushing them out. Let them harden two more days, then fit a 6 to 8 mm jump ring and a key ring.

Print details

2 h 40 minPrint time
~80 gFilament
1Printed parts
180 × 122 × 18 mmSize (W x D x H)
All print details
Print details
Cast materialResin
Printed parts1
Size (W x D x H)180 x 122 x 18 mm
Print bed needed180 x 122 mm, 18 mm tall
Filament~80 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed caster (STL) + one set of six blanks (STL) + tool master (STL) + print and pour sheet
Added2026-09-26
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Made with the free Tray mold generator. Upload your own model and get the same kind of mold built around it, in your browser.

Download free on Thingiverse

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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.

New to casting? Read the ice cube tray mold guide.

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Questions about this design

Which shape in the resin keychain mold set is best for dried flowers?

The circle and the arch: both have a large, even face with no points, so a pressed flower lies flat and stays away from the edge. Pour a 2 mm layer, let it gel, lay the flower face down and fill to just below the post. The star suits glitter better than flowers.

Can I use UV resin in the resin keychain mold set?

Yes, in layers of 2 to 3 mm, curing each under a UV lamp for the time on the bottle. The blanks are 5.5 mm thick, so two layers fill them. UV light cannot cure through heavy pigment or glitter, so keep the colour in thin layers or use epoxy for opaque blanks.

How big a jump ring fits the keychain set blanks?

The hole is 3.8 mm across and sits 3 to 4 mm from the edge, so a 6 to 8 mm jump ring of 1 to 1.2 mm wire goes through easily. Open the ring sideways with two pliers, never outward, and close it fully so the key ring cannot slip out.

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