I can't print that part in my chosen -> (abundant) prototyping filament.  ABS.

The Boulevard of broken hubs. 

The white ones are the latest ABS. The black and magenta ones are failed attempts at sealing without using an O-ring.

Whooo hooo... *cough* ho. *cough* *cough*.  

I hate ABS.

The geometry either makes it pull off the bed on cooling at high temps, or have crap layer adhesion and edge cracking at the geometrically accurate temps.  

Anyway, it is probably better to change the geometry rather than provide people with one part that is stupidly hard to print without warping, warping ruins the part as the edge thickness is critical, and it happens right at the end.. every time.  I quit.

I tried wacky things like applying temperature gradients to the part by mucking with the bed temperature during/after printing.  

Note to self: you can't anneal parts with massive voids.  The massive voids collapse and you have a warped mess.  

You *can* anneal solid or nearly solid parts, right on the heated bed if your bed goes high enough.

Annealing relieves the internal stress of your parts.  They get stronger, and shrink asymmetrically.  Simple to deal with for flat parts with no voids.

I actually think I am going generate a conservative/strong anneal able model to run nylon.  I just remembered I have some.  A little test roll.

And I also have some suitable PTFE for rebuilding the liner of my non all-metal hot-end when it eats itself somewhere during running nylon, and some stainless threaded rod when I get desperate later when that fails and build a new throat from scratch in desperation.

I'm going to change back to a variation on the spokes again, perhaps one optimized for single path 3D printing.  :)  

If you make your spokes and wall dimensions a multiple of the nozzle size, you can count these so they end up adding up to the same number of in/out trips.  Then the slicer can draw this as a much more consistent extrusion and your parts are stronger and shrink along nice concentric paths during annealing.  

Or so goes the plan.

Tonight.