0.9 deg steppers versus 1.8 with ramps

I current have 1.8 deg steppers on my kossel mini running off a ramps board. 0.9 degree steppers should offer better resolution but will the increased steps required to drive them be too great for a ramps board to handle?

Edited 1 time(s). Last edit at 12/23/2015 10:29AM by DjDemonD.

Yes if you are running Marlin. Not sure about Repetier. To get good travel speeds on a delta with 0.9deg motors, use 32 bit electronics and 24V power.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thanks David. I found this thread on Google groups [groups.google.com] which you contributed to which provides a very detailed discussion of this issue. I think I might just try 16 tooth pulleys at this stage the jump up to 100 steps/mm should be manageable.

I ran my delta with 1.8° and DRV8825 drivers ( decay hacked ) which is the same step/mm setting. Max. printspeed was 80mm/s.
I then upgraded to 0.9° and Duet 0.6 and got 2-3 times lower deviation with David's auto bed calibration.
Just for the record, I also rebuilt it with aluminum parts from robotdigg.
-Olaf

I've used 0.9 degree stepper motors with A4988 drivers set to x8 and x16 stepping on ramps with repetier firmware ( I use it because I can get lots more segments/s than with marlin), and switching between 200 and 100 steps/mm and I have to say, setting it to 100 steps/mm with x16 stepping gives nicer results. The x8 stepping gives more of a moire pattern than with x16 stepping at 100steps/mm.

EDIT: tl;dr get 0.9 degree stepper motors as they definitely give better resolution.

Edited 2 time(s). Last edit at 12/29/2015 01:36AM by TTN.