\[ x^3z+x^2+yz^3+z^4 = 3xyz \]
- degree 4
- singular an the z-axis
- singular at the origin, too!
I really like Tobel. It's smooth flowing curves and voids attract my eye and hand. In my mind, it evokes a feeling akin to that of Eistute
To print Tobel gave me trouble, but neither for mathematical nor computational reasons. I battled for four months a persistent failure problem on one of my printers, and this was the test piece. Why did I choose Tobel? It was next in the sequence to print (thanks Foong Min Wong!) and especially beautiful to me. The persistent failure was eventually solved by running a grounding wire to the extruder motor.