Benchy is a fantastic and fun torture test for 3D printing (http://www.thingiverse.com/thing:763622); but he doesn't float!.
I have made a few accessories to add to Benchy that helps with buoyancy and plugs some holes. The result is a floating Benchy!.
The accesories are clip on bump tyres, port hole plugs and a hold cover.
These accessories work fine with Benchys that were printed in PLA at 15 and 20% infill; I haven't tested them on other materials or %infills so they either might not work or may need to be positioned differently.
He will not float on anything other than very still water as he still floats very low down in the water. You also need to be careful placing in the water. Also after time water does leak in so he does not float very long either but this is only intended as a bit of fun!.
As the Benchy license does not allow modifications - I have contacted the designers and they have given their approval to post these accessories. Many thanks to Creative Tools for their support.
Print all the tyre parts and push fit or glue together the tyre and clip. All the parts are separate files for printing in different colours. The tyre insert is optional for either colour matching to the Benchy or to provide a better finish if your bridging is not great.
In the red Benchy in the photo I printed the hold plug from Bronzefill to allow more weight at the rear. He will still float with a normal PLA plug and the black Benchy has a PLA hold plug.
Only the hold plug really needs to be 100% infill; the tyres in the photo were printed at 0% infill for greater buoyancy but also work at 100%.
You might need to sand the port hole plugs a little to fit as these are intentionally very tight.