◆ Concrete
Concrete phone stand mold
A heavy concrete phone and tablet stand, 80 mm wide, as a silicone mold from printed parts.
◆ Concrete
A heavy concrete phone and tablet stand, 80 mm wide, as a silicone mold from printed parts.
A solid wedge-shaped desk stand, 80 mm wide, 72 mm deep and 70 mm tall, with rounded edges. The phone leans back at a comfortable 66 degrees for video calls and recipes, its bottom edge sitting in a 12 mm slot behind a front lip, wide enough for a phone in a thick case or a small tablet. Cast solid, it weighs around 400 g and does not tip.
Made with the box mode of our silicone mold maker, contoured to the stand: print the base with the stand fused onto it, the walls and the clamps, pour about 748 ml of silicone, and the silicone block is your mold. Turn it over and the stand casts upside down, its flat bottom as the open face you fill.
Cast them in grey concrete, white Jesmonite or terrazzo with coloured chips: a desk piece that sells well at markets next to a matching pen holder. The zip carries every printed part, the stand master as its own STL, the tool's own print-settings sheet and a recipe file for the generator.
Shown as a 3D render of the printed mold parts pulled apart around the master, not a photo.
Print the base with the master fused onto it, the two walls and the two clamps.
Stand the base on the table. Set each wall down a few centimetres out from it and slide it in over the table until the ridge round the base sits in the groove at its foot, then slide the clamps down over the seams. Once they are on, the walls cannot lift, and the ridge seals the bottom.
Mix 801 ml of silicone in one batch and pour it into a corner, letting it rise around the master until it covers the top.
Once it has cured, take the clamps off, slide the walls straight out and pull the silicone block off the master. That block is your mold.
Turn the block over: the opening is the bottom of the stand. Fill it with a fine concrete mix or Jesmonite, tap the sides for a minute to raise the air, and strike the bottom flat.
Demold after a day, sand the bottom flat, seal the stand and stick felt or cork pads underneath so it grips the desk and does not scratch it.
Print details
| Cast material | Concrete |
|---|---|
| Printed parts | 5 |
| Size (W x D x H) | 108 x 100 x 106 mm |
| Print bed needed | 130 x 101 mm, 106 mm tall |
| Filament | ~331 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: 5 printed parts (STL) + phone stand master (STL) + print sheet + recipe |
| Added | 2026-09-25 |
Pro early access until October 25, 2026, then free with any account.
Make your own silicone mold →Made with the free Silicone mold maker 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 silicone mold maker guide.
Yes. The slot is 12 mm wide, which takes a phone in a rugged case, and the lean face is 80 mm wide and tall enough for a phone in portrait or landscape. A small tablet up to about 10 mm thick fits too.
In landscape, yes: the cable plugs into the side of the phone and hangs past the stand. In portrait the bottom of the phone sits in the slot, so it can charge wirelessly if you glue a thin charging pad to the lean face.
About 400 g in ordinary concrete and about 350 g in Jesmonite. That weight is the point: it stays put when you tap the screen. Felt or cork pads underneath stop it sliding on a glass desk.
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