◆ Resin

Resin coaster holder mold

A holder for six resin coasters standing on edge, sized for our 96 mm round, square and hexagon coasters. A silicone mold you make yourself.

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3D render of the coaster holder master on its printed base between the orange and blue walls, with a blue resin coaster holder in front
Resin ~279 g

A coaster holder that keeps six coasters standing on edge: a slot 100 mm long and 50 mm wide on a 5 mm floor, end posts 48 mm tall, and side walls 26 mm tall that dip to 16 mm in the middle so the faces of the coasters show. It is sized for the round, square and hexagon resin coaster molds in this library (96 mm, 7 mm thick), and takes most coasters up to 98 mm across. Cast it in a matching colour for a set. It takes about 110 ml of resin.

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Made with the box mode of our silicone mold maker. The holder stands on its foot, so the silicone block is an open mold with the underside as its opening: the slot becomes a silicone core. The outside leans in and the slot widens going up, so the silicone lifts straight off. Print the base with the holder fused onto it, the two walls and the two clamps, and pour about 810 ml of silicone.

The zip carries every printed part, the holder 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 with a cast holder in front, not a photo.

Resin coaster holder mold 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 866 ml of silicone, ideally platinum (mix it in one batch)
  • Epoxy casting resin, about 110 ml per holder, with pigment or mica
  • A heat gun or torch for the bubbles, and a level surface
  • Wet sandpaper from 400 grit and felt pads for the underside

How to cast it

7

  1. Print the base with the master fused onto it, the two walls and the two clamps.

  2. 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.

  3. Mix 866 ml of silicone in one batch and pour it into a corner, letting it rise around the master until it covers the top.

  4. 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.

  5. Turn the block over and set it on a level surface, opening up. The core in the middle forms the slot the coasters stand in.

  6. Mix the resin slowly and pour it in a thin stream into one end post, letting it run along the walls into the other until it is level with the opening. Pass a heat gun over it to pop the bubbles.

  7. Let it cure as long as the resin says, usually 24 to 48 hours. Peel the silicone back off the outside, ease the holder off the core, sand the underside flat if it needs it and stick felt pads on.

Print details

8 h 20 minPrint time
~279 gFilament
5Printed parts
146 × 94 × 84 mmSize (W x D x H)
All print details
Print details
Cast materialResin
Printed parts5
Size (W x D x H)146 x 94 x 84 mm
Print bed needed168 x 94 mm, 84 mm tall
Filament~279 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: 5 printed parts (STL) + coaster holder master (STL) + print sheet + recipe
Added2026-10-01
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.

Download free on Thingiverse

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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.

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Questions about this design

Which coasters fit the resin coaster holder?

Up to six coasters 96 to 98 mm across and up to 7 mm thick, such as the round, square and hexagon resin coasters from the molds in this library. Square coasters stand flat on the floor of the slot, round ones rest in it without rolling, because the walls hold them.

Can I make a holder and coasters as a matching set?

Yes, that is what it is for. Mix one batch of resin in the same colour or swirl for the holder and the coasters, or pour the holder in a solid colour that picks up one colour of the coasters. A set of four coasters and a holder makes a good gift or market item.

Can I cast the coaster holder in concrete or Jesmonite?

Yes. The same silicone mold takes Jesmonite or a fine concrete; the walls are 5.5 mm or thicker, which a fine mix fills if you tap the block while you pour. Seal it so damp coasters do not stain it.

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