◆ Concrete
Concrete house number mold, digits 0 to 4
Modern house numbers 0 to 4, 95 mm tall, cast in concrete straight in one printed tray that fits a 220 mm bed.
◆ Concrete
Modern house numbers 0 to 4, 95 mm tall, cast in concrete straight in one printed tray that fits a 220 mm bed.
A printed tray for five modern concrete house numbers, 0, 1, 2, 3 and 4, each 95 mm (3.7 inch) tall and 22 mm thick, in a bold signage typeface with softly rounded corners. The digits read from across the street, and the rounded edges do not chip when a number is knocked on the wall. Together they take about 450 ml, about 990 g of concrete, so each digit weighs around 200 g.
Made with our tray mold generator in its rigid tray mode: print the tray, wipe in release and pour concrete, Jesmonite or plaster straight in, no silicone. The digits are cast FACE DOWN, so the front of each number comes off the smooth tray floor and the back is the side you strike flat. Every side is drafted, and the counters of the 0 and the 4 are drafted posts, so the digits lift out clean. The tray is 202 x 213 mm and fits a 220 mm printer bed.
The other half of the set is the 5 to 9 tray in this library, the same size and typeface; cast a second tray for a repeated digit. The zip carries the tray exactly as the tool exported it, the five digits on their own as an STL, the master uploaded to the tool, and a print and pour sheet with the volume of the set.
Shown as a 3D render of the printed tray with the concrete digits in front, not a photo.
Print the tray as exported, cavities up, no supports. PLA is fine.
Wipe a thin film of mold release or cooking oil into every cavity, including the grooves.
Mix a fine concrete or Jesmonite to a thick pour, fill each cavity, and vibrate it out: tap the tray on the table or hold a sander against the side for a minute until no more bubbles rise.
Cover the tray and let it cure for 24 hours, then flex the tray and tip the pieces out. Sand the back flat, and seal them once they have dried for a few days.
To mount them floating off the wall, drill two 6 mm holes 15 mm deep into the back of each digit, glue in 6 mm threaded rod or dowel with a construction adhesive, and set the rods into matching holes in the wall with a 10 to 15 mm spacer. On brick or render, a bead of construction adhesive on the back works too.
Print details
| Cast material | Concrete |
|---|---|
| Printed parts | 1 |
| Size (W x D x H) | 202 x 213 x 30 mm |
| Print bed needed | 213 x 203 mm, 30 mm tall |
| Filament | ~432 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: printed tray (STL) + one set of five digits (0 to 4) (STL) + tool master (STL) + print and pour sheet |
| Added | 2026-09-27 |
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.
The tray casts the back of each digit as the open pour face, so it cannot form a keyhole there. Drill two 6 mm holes about 15 mm deep into the back once the concrete has cured for a week, glue in lengths of threaded rod, and push them into plugged holes in the wall for the floating look. On brick or render, construction adhesive alone holds them.
Yes, once cured and sealed. Let them cure for a week, then brush two coats of a clear penetrating concrete sealer over every face, including the back. Sealed concrete shrugs off rain and frost; unsealed digits take up water and can flake in a hard winter.
Pour the tray twice. It takes about a day between pours for concrete to cure enough to come out, or an hour or two with a rapid-set craft cement. Cast the 5 to 9 tray from this library for the other digits.
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