Is this 3D model free to download?

Yes, Bob the Cartesian Diver is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link to open the original listing by the creator.

Where do I download the STL file?

The download is hosted by Thingiverse. Use the "Download from Thingiverse" link on this page to open the original listing and grab the file, or save it to your print queue in the free Thinger app.

Designed by trayracing, published on Thingiverse. Please credit the creator when sharing your print.

Can I print this at home?

Yes. This is a printable 3D model intended for home FDM and resin printers. Check the original listing for suggested print settings.

Bob the Cartesian Diver 3D printable model by trayracing

Bob the Cartesian Diver

Source: Thingiverse by trayracing

The Bob the Cartesian Diver is a free printable 3D model from Thingiverse by trayracing. This is Bob. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Thingiverse

59 saves Source: Thingiverse Updated 2026-10-16 License: CC-BY · commercial OK 1 makes Category: Education & Science

Tags: Bob, the, Cartesian, Diver

About this model

This is Bob. Drop Bob in a bottle of water. Squeeze the capped bottle and Bob will take a dive. Release, and he'll rise. Why? See, Bob has gas. You squeeze the bottle, Bob's bubble shrinks and he sinks. Let go, the bubble grows, and up he goes. Warning: Adult supervision required! Choking hazard for thirsty kids. Don't drink Bob's bath water either. eww. Bob is a fun toy, but he's a STEM tool too. See the STEM section below for ideas and questions Cartesian divers are an old idea. See Wikipedia for more detail.

Frequently asked questions

Is this 3D model free to download?: Yes. Bob the Cartesian Diver is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link above to open the original listing.
Where is the STL hosted?: The download is hosted by Thingiverse, not by Thinger. We link you directly to the original listing by trayracing.
Who made this model?: Designed by trayracing, published on Thingiverse. Please credit the creator when sharing your print online.
Can I print this at home?: Yes. This model is intended for home FDM and resin 3D printers. Check the original listing for suggested print settings like layer height and supports.