◆ Resin
Round resin keychain mold
Nine round resin keychain blanks per pour, 48 mm across with a hole for the ring. Silicone you pour yourself.
◆ Resin
Nine round resin keychain blanks per pour, 48 mm across with a hole for the ring. Silicone you pour yourself.
A silicone mold for nine round resin keychain blanks, each 48 mm across and 5.5 mm thick with rounded edges, and a 3.8 mm hole near the top left by a post in every cavity. A circle is the most useful blank there is: it takes a photo, a monogram, a flower or a shaker-style glitter swirl.
Made with our tray mold generator in its flexible silicone tray mode: print the caster, pour silicone into it and peel out a flexible nine-circle mold. Each blank takes about 10 ml of resin, and the flexible tray peels off without stressing the thin blanks.
Round blanks also make coasters for a doll house, ornaments and bag tags. The zip carries the printed caster exactly as the tool exported it, one blank 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 light blue resin blanks in front, not a photo.
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.
Mix 248 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.
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.
Fill each cavity to just below the top of its post (about 10 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.
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
| Cast material | Resin |
|---|---|
| Printed parts | 1 |
| Size (W x D x H) | 165 x 165 x 15 mm |
| Print bed needed | 166 x 165 mm, 15 mm tall |
| Filament | ~118 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: printed caster (STL) + one keychain blank (STL) + tool master (STL) + print and pour sheet |
| Added | 2026-09-26 |
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 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.
A 44 to 45 mm circle, which leaves a clear 1.5 mm rim of resin round it; a standard 1.75 inch circle punch is the right size. Keep the top 8 mm clear or trim a notch, because the hole post sits there, and seal the print before it goes in.
Pour a thin layer of white resin, let it gel slightly, then drop in alcohol ink with a little white ink on top and let it sink and bloom. Keep the cavity level and do not heat it much, which flattens the cells. Seal with a clear layer once it has set.
Yes. Once fully cured, after about three days, the flat back takes vinyl, UV DTF transfers and permanent marker, and sanded resin takes a laser engraver at low power. Add a thin clear dome of resin over vinyl so it does not peel.
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