◆ Resin

Dog tag resin keychain mold

Ten dog tag resin keychain blanks per pour, 30 x 52 mm with a hole at the top. Silicone you pour yourself.

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3D render of the printed caster for a ten-cavity dog tag resin keychain mold, with three glossy lilac rectangular resin keychain tags in front
Resin ~106 g

A silicone mold for ten rectangular dog tag resin keychain blanks, each 30 x 52 mm and 5.5 mm thick with 7 mm rounded corners. A post at the top of every cavity leaves a 3.8 mm hole for a jump ring, centred so the tag hangs straight.

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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 ten-tag mold. Each tag takes about 8 ml of resin, and the long flat face is the best canvas in the set for a name, a date or a word.

Tags make pet ID backs, bag tags, bookmarks with a tassel and name keychains for a whole class at once. The zip carries the printed caster exactly as the tool exported it, one tag 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 three lilac resin tags in front, not a photo.

Dog tag resin keychain mold 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 211 ml of silicone, ideally platinum (mix it in one batch)
  • Epoxy casting resin or UV resin, about 8 ml per tag
  • Vinyl letters or a paint pen for names, glitter or mica
  • Jump rings, key rings or tassels

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 211 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 (about 8 ml each) 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

3 h 30 minPrint time
~106 gFilament
1Printed parts
181 × 120 × 15 mmSize (W x D x H)
All print details
Print details
Cast materialResin
Printed parts1
Size (W x D x H)181 x 120 x 15 mm
Print bed needed181 x 121 mm, 15 mm tall
Filament~106 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed caster (STL) + one keychain blank (STL) + tool master (STL) + print and pour sheet
Added2026-09-26
Make your own tray mold →

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

Free download. Opens the Thingiverse listing 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.

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Questions about this design

How do I put a name on a dog tag resin keychain?

The easiest way is vinyl: once the tag is out, stick the letters on the flat back and brush a thin dome of resin over them. To embed the name, pour half the cavity, let it gel, lay the vinyl or a printed name face down, then fill to just below the post.

Can the dog tag keychain be used as a pet ID tag?

As a decorative tag, yes, but it is thicker and lighter than a metal tag and resin can crack if a dog chews it. Add the phone number with vinyl sealed under resin, hang it on a split ring, and check it now and then for chips at the hole.

How do I stop the dog tag keychains from bending?

They bend when they come out before the resin has hardened. Leave epoxy at least 24 hours before you flex the tray, lay the tags flat for two more days, and use a casting resin rather than a thin coating resin, which stays flexible in a 5.5 mm tag.

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