Ready to use, install or paint. Your piece is 3D printed in your chosen filament colour and supplied unpainted. Enjoy it as it is or paint it to create your own finish.
Two moody stone characters bring a little humour to your enclosure. Angry has a heavy brow and a wide mouth, while Sleepy has closed eyes and a rounded opening. Both are hollow caves, ready to tuck among stones and planting or use as a matched pair.
At a glance
-
Sizes: four pair sizes, with the dimensions of each character listed below. Custom sizing is available.
-
Material: PETG, resistant to water and humidity. Keep clear of direct contact with heat lamps and other heat sources.
-
Floats: Printed PETG pieces can float because they contain air. For aquarium use, secure the base with aquarium-safe silicone or a suitable aquarium adhesive as described under “Good to know”.
-
Finish: unpainted, with a separately chosen PETG finish and colour for each cave.
-
Included: two Grumpy Stone Caves — one Angry and one Sleepy. Quantity 1 means a set of two caves. Plants, animals, substrate and display accessories are not included.
-
Made to order: ships within 7 business days.
-
Free shipping: free delivery to Canada, the US and select European countries. Duties and import fees to the US are prepaid by us.
Choose your pair size
Each row is a set of two. Dimensions are approximate width × depth × height in centimetres and refer to the outside of each cave, not its entrance.
| Size |
Piece 1: Angry |
Piece 2: Sleepy |
| Size 1 |
6.4 × 6.0 × 5.4 |
7.0 × 7.8 × 4.7 |
| Size 2 |
6.5 × 6.0 × 5.5 |
7.0 × 7.8 × 4.7 |
| Size 3 |
12.0 × 11.2 × 10.1 |
12.0 × 13.4 × 8.1 |
| Size 4 |
15.0 × 13.9 × 12.6 |
15.0 × 16.8 × 10.1 |
Your two characters
Piece 1 is Angry. Piece 2 is Sleepy. Use the separate Piece 1 and Piece 2 finish and colour selectors. The close-up photographs in the gallery identify each character. Other stone characters shown in group photographs are not included.
Need a different size? These standard variants are not the limits of what we can make. Width, height, depth and proportions can often be adjusted to fit your enclosure; small changes may not materially affect the price. Message Molten Modern with your enclosure dimensions for a custom quote.
Piece 1: Angry

Piece 2: Sleepy

Colours
For each cave, first choose a finish (Basic, Matte, Marble, Metal-Like or Glow-in-the-Dark), then pick a colour from that finish. Metal-Like includes our Galaxy, Sparkly and Metallic colours. There are 75 PETG colours in total, and the colour charts at the end of the photos show each one. Want something that is not listed? Contact us and we will try to source it.
Use and care
Place on a stable surface and choose a size with openings suitable for your enclosure’s inhabitants. Listed dimensions are the overall exterior dimensions, not entrance clearances. The two pieces are separate and can be arranged independently. Hand wash gently and clean regularly.
Good to know
-
Anchoring in an aquarium: Bond the base to a flat stone or acrylic sheet with aquarium-safe silicone, or with hot glue or cyanoacrylate superglue specifically suitable for aquarium use. Follow the adhesive manufacturer’s surface preparation and full curing instructions before placing it in the aquarium.
- Where the design permits, a few small holes through the underside into enclosed air pockets let water in and air out, reducing buoyancy.
- Measure the inside of your enclosure before ordering, and leave a little room for installation.
- Some photos show hand-painted examples. This piece ships unpainted in your selected filament colour.
Design licensed to Molten Modern by novYTerra.