◆ 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.
◆ Resin
Six resin keychain blanks in one pour: heart, circle, star, dog tag, oval and arch. Each has its hole.
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.
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.
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 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.
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 (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.
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) | 180 x 122 x 18 mm |
| Print bed needed | 180 x 122 mm, 18 mm tall |
| Filament | ~80 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: printed caster (STL) + one set of six blanks (STL) + tool master (STL) + print and pour sheet |
| Added | 2026-09-26 |
Pro early access until October 26, 2026, then free with any account.
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.
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.
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.
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.
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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