This is a simple painters pyramid or triangle used for drying boards or projects after painting and staining.
I've often had occasions where I've painted a project or stained a piece of wood, and I need to rest it on an edge to dry to prevent it from sticking. I started nailing a series of finishing nails into scrap wood to create tripods for my pieces to rest on, and I thought that there must be a better way.
These are simple 1" triangular pyramids similar to these that have printed fine with no support. Each piece takes about 10 minutes on our Taz 5 with no infill. This does make the pyramids pretty weak, but I'm generally not working with anything too heavy - so, these work just fine. I've started to use these as a quick verification print for my 3D printers too. It's fast enough and has a mild level of complexity for testing extrusion temperatures and retraction settings.
Here is a link to the Onshape model used to generate this:
There are probably many ways to draw this, but what I did here was to draw a single base triangle and then do a circular pattern / clone & rotate by 60 degrees three times. The four pieces share just an edge, and it is possible that the 3D print might not fuse these. In the 2 - 3 dozen prints I've done so far, they've all come out great. You should be able to adjust the dimensions of the 1st sketch, and the rest of the model should scale appropriately.