Torture Spider, 3D-printer torture test - overhangs - cooling - retraction

Edit 2019-02-26: added a slightly easier version with less overhangs on the legs.

What
A 3D-printer torture test. Highlights cooling, overhangs, stringing and more.
Can you beat it?
(Made for a 0,4mm nozzle, smaller nozzles will have an advantage)

Why
I wanted a model to use while finding the optimal layer height for overhangs and to verify that my cooler has effective and even cooling over 360°.

Print recommendations
Maximum cooling!
For me, best results on overhangs is around 0,12 to 0,16mm layer height.
I used two walls, no infill.
Use a brim if you don't have great bed adhesion. I printed without a brim on a clean buildtak without issues.

Understand and improve the results
-Use maximum cooling, if some legs looks bad and some good, your cooler may not be cooling evenly. But it can also be settings related, if the printer is printing one leg last on a layer and then immediately continues printing the next layer on the same leg, it will get hotter than the other legs. Try playing with the Z-seam settings or rotate the model to see if the issue moves to another leg.
-Look for how well the overhangs looks on the legs, experiment with slower speeds and lower layer heights to improve. But don't go lower than necessary, in my experience a too low layer height causes more upwards curling on difficult overhangs.
-To find the best retraction settings, start at 0mm and increase retraction length by a small amount until the stringing stops improving. Next try different retraction speeds (faster isn't always better). Lower temp if possible and try adding a small amount of coasting.
But don't change more than one thing at a time!

Share your result
Post pics of your best results, include printer model, cooling mods and nozzle size.

https://youtu.be/AnPs7Sz5uAk