.9deg vs 1.8deg motion or extruder?

[gnydick]

I have 2 x .9deg motors and 2 x 1.8deg motors. I have 2 extruders. It's a decently large CoreXY. Which should I use for the axis and extrusion? The extruders are Flexion direct drive with no gearing. The motors are ...

1.8 -- https://www.moonsindustries.com/p/nema-17-standard-hybrid-stepper-motors/ms17hd6p4200-000004611110008905
0.9 -- https://e3d-online.dozuki.com/Document/175/.pdf

Also, if there's anything you can teach me about why you'd go one way vs. the other, I'd appreciate learning.

I'd like to use the e3d for extrusion because they're .24kg in weight and the 1.8 are .36kg in weight, so less weight on the gantry.

[Veti]

@gnydick said in .9deg vs 1.8deg motion or extruder?:

ungeared go with 0.9
see
https://duet3d.dozuki.com/Wiki/Choosing_an_extruder_drive
you want it so that individual extruder microsteps are not visible in the print.

there is a reason as to why the most popular extruders use a 3:1 ratio. as steps in the range above 300-400 provide the best results.

[jay_s_uk]

0.9 give you better resolution on the x and y axis so that would be my first shout. But they're only 35Ncm, which is not the best.

In an ideal world you'd have 0.9 on x and y and the others on the extruders. But the 1.8 are 48mm which is overkill for an extruder and is extra weight you could do with without.

So if you can run c and y with only 35Ncm, use those. But you may find you skip steps etc so really, go with the 1.8s on the x and y and 0.9 on the extruders

[dc42]

For an ungeared extruder, use a high torque 0.9deg motor. But I would always choose a geared extruder.

[gnydick]

@dc42 thanks. Until the recent release of Hemera, I had to use Flexion because I need reliable flexible printing. I didn't know if any other extruded that was as capable. It runs ingested.