SARS Coronavirus 2

thingiverse

I created 3D individual component models using the JOINvirus.step file from GrabCad user FredSWUG, which can be printed on a single extruder machine with limited support. The link to the original work is below. I printed the three pieces of the virus at 50% scale, making the spherical core 3" in diameter. I modeled the base to fit perfectly, so it was printed at 100% scale. I made edits to the virus component models in Solidworks 2019. The base was modeled from scratch using FreeCAD 0.18. It was sliced with Cura 4.5. From memory, I think the core was printed with 6 wall lines (a bit of an accident, normally I set it to 3), 10% cubic infill, and gradual infill steps set to 2. The spikes were printed with 3 wall lines, 25% cubic infill, and 2 steps. The base was printed with 3 wall lines and zero infill. The core had about a 1-1/2" diameter support underneath. The internal bosses and holes in the core printed very well despite the 10% infill setting. I think this was due in part to accidentally setting the wall lines to 6. The spikes were printed vertically with support only around the "pegs". I printed one large spike per the original design, but the remainder were printed as small spikes in batches of 6. I had to use brim to keep them adhered to the build plate because the first batch was printed with skirt and they were knocked out of position at about 3/4 complete. I used no foam clear Gorilla Glue to affix the spikes to the core. I'm sure super glue would be fine as well.