https://www.posetteforever.com/viewtopic.php?f=23&t=3957&p=45124#p45124
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Nik
Sunday, 28 January 2018, 07:22 PM

Custom Graph Paper Generator --Free !!
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Playing with spiral stairs, it is very hard to draft steps that are not standard paper's 2, 5 or 10º.

But, I found a site that does custom increments, on a wide choice of page sizes, as free PDF...
https://incompetech.com/graphpaper/polar/

I've just dialled up 20º spokes, 5 rings (representing 2', 4', 6', 8' & 10' feet) and an open centre for least clutter.
FWIW, this facility may also be handy as a 'reality check' when laying out arches...

They also do traditional 'squared' format and a zoo of other stuff...