◆ Resin

Number resin keychain mold, 0 to 9

Ten bubble number keychains, 0 to 9, each with a key ring hole. Birthdays, jersey numbers and house keys.

Make your own tray mold
3D render of the printed caster for a number resin keychain mold with the digits 0 to 9, and ten yellow bubble number keychains with ring tabs in front
Resin ~84 g Pro early access

A silicone mold for the ten digits 0 to 9 as chunky keychains, in the same rounded bubble typeface as our alphabet trays, 35 mm tall and 5.5 mm thick. Every digit has a round tab with a post in the cavity, so it comes out with a 3.8 mm hole for a jump ring and the counters of 0, 4, 6, 8 and 9 open.

Read more

Made with our tray mold generator in its flexible silicone tray mode: print one part, a caster, pour a platinum silicone into it and peel it out. That silicone is the resin mold, and it releases resin with a gloss and no release agent. The set of ten takes about 45 ml of resin.

Numbers sell for birthdays, anniversaries, sports jersey numbers, locker and house keys, and years like 2026. Pair them with the letter trays for names and dates. The zip carries the printed caster exactly as the tool exported it, the ten digits on their 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 the ten yellow resin numbers in front, not a photo.

Number resin keychain mold, 0 to 9 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 225 ml of platinum silicone (mix it in one batch)
  • About 45 ml of epoxy casting resin for all ten digits, or UV resin
  • Pigment, glitter or a team colour, and gold leaf for anniversaries
  • Jump rings (6 to 8 mm), key rings, nitrile gloves and a heat gun or lighter

How to cast it

5

  1. Print the caster as exported, open side up, no supports. Turn on ironing for the top surfaces, or sand the raised shapes smooth and brush on XTC-3D: the silicone copies every layer line, and resin shows each one on its glossy face.

  2. Mix 225 ml of platinum silicone 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 as long as its datasheet says and peel it out. That silicone is your resin mold: platinum silicone gives resin a glossy face and needs no release agent.

  3. Work in a ventilated room with nitrile gloves on. Mix epoxy casting resin exactly at the ratio on the bottle, stir slowly for three minutes scraping the sides, and let it rest a few minutes so the bubbles rise.

  4. 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 ten digits take about 45 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 mold against dust.

  5. Leave epoxy 24 hours (UV resin: cure each layer under the lamp), then flex the mold and peel it off the pieces rather than pushing them out. Let epoxy harden two more days before you fit jump rings, hooks or a tassel.

Print details

2 h 50 minPrint time
~84 gFilament
1Printed parts
189 × 104 × 18 mmSize (W x D x H)
All print details
Print details
Cast materialResin
Printed parts1
Size (W x D x H)189 x 104 x 18 mm
Print bed needed189 x 105 mm, 18 mm tall
Filament~84 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed caster (STL) + one set of ten numbers (STL) + tool master (STL) + print and pour sheet
Added2026-09-27

Pro early access until October 27, 2026, then free with any account.

Like it or post your print on Thingiverse

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.

number resin moldnumber keychain moldresin number molddigit silicone moldbirthday number keychainjersey number keychain

Questions about this design

How do I make a two-digit number keychain from the 0 to 9 mold?

Cast both digits, then join them side by side with a 6 mm jump ring through each tab onto one split ring, or glue them edge to edge with a drop of resin once both are fully hard. For a year like 2026 you need two 2s, so pour the tray twice or keep a second silicone copy.

Can the 6 from the number keychain mold be used as a 9?

No. Both are drawn with the tab at the top of the digit, so a 6 turned over would hang from its bottom with the tab underneath. The tray has its own 9 for that reason, and each digit hangs the right way up with its hole at the top.

What makes number keychains look professional?

Clean edges and a glossy front. Sand the raised digits on the printed caster smooth or coat them before you pour the silicone, so the resin face has no layer lines, and file the poured back flat with wet sandpaper, then give it a thin coat of resin for the same gloss as the front.

More designs