just go for the standard [www.aliexpress.com]
$74.61USD or $90NZD(approx) including shipping
Know to work well on repraps, and no issues getting to New Zealand
Re 0.9 vs 1.8 degrees..
If your running a standard Cartesian (I2, I3 etc) with 1.8 at 1/16 micro stepping using gt2 belts and a 16 tooth pulley = 100/mm ie 10micron resolution
the same thing with .9 you get 5 micron resolution. Ie you will never notice the difference. Especially when you consider the average nozzle, .35mm which extrudes about .52 ie 520 microns.
Now if your building a Delta (which on re reading I see that you are) they have variable resolution across the bed. A 0.9 do apparently help to increase resolution when in its low resolution areas.
NB if you use a 0.9 you have to use twice as many steps/mm so you do lower your max speed compared to a 1.8
$74.61USD or $90NZD(approx) including shipping
Know to work well on repraps, and no issues getting to New Zealand
Re 0.9 vs 1.8 degrees..
If your running a standard Cartesian (I2, I3 etc) with 1.8 at 1/16 micro stepping using gt2 belts and a 16 tooth pulley = 100/mm ie 10micron resolution
the same thing with .9 you get 5 micron resolution. Ie you will never notice the difference. Especially when you consider the average nozzle, .35mm which extrudes about .52 ie 520 microns.
Now if your building a Delta (which on re reading I see that you are) they have variable resolution across the bed. A 0.9 do apparently help to increase resolution when in its low resolution areas.
NB if you use a 0.9 you have to use twice as many steps/mm so you do lower your max speed compared to a 1.8