I have an issue trying to move the steppers bellow 0.1mm. My Delta printer is using 1/8o stepper motors with pulleys with 20t and 1/16 microstep drivers, so all steppers are using 80mm steps/unit in Marlin. If I try to move for example (I have tested with a dial indicator): G1 Zx.x5 It doesn't move. G1 Zx.x7 It moves, but for some reason it rounds to x.x+1 The command M114 shows the axis right numbers (without rouding); I didn't found in Marlin any settings to fix this. Anyone knows how to fix this ? So If I need layers at 0.25mm in fact they are been printed at 0.25mm https://reprap.org/forum/read.php?14,809640,809640#msg-809640 Wed, 11 Mar 2026 03:27:46 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?14,809640,810170#msg-810170 https://reprap.org/forum/read.php?14,809640,810170#msg-810170
Just discovered an option in configuration_adv.h:

// Moves (or segments) with fewer steps than this will be joined with the next move
#define MIN_STEPS_PER_SEGMENT 6

Changed it to:
#define MIN_STEPS_PER_SEGMENT 1

Wow, now I got it to work.

Thanks]]> serandre Mechanics Tue, 13 Feb 2018 18:11:19 -0500 https://reprap.org/forum/read.php?14,809640,809929#msg-809929 https://reprap.org/forum/read.php?14,809640,809929#msg-809929
With the common RepRap-style setup and relative weak direct drive steppers it's an "ineffective" relation between friction, stip-slick and torque.

With much stronger steppers (2Nm or more torque, instead of some ten mNm as with the typical 3D-printers) and optional gearing, micrsotepping will propagate "stepwise" without stalling or "jumping" (as long it isn't blocked by too high loads).

I have IMS drivers with 1/256 microstepping and 3A current (4A peak), what's pretty good/precise even with highest microstepping with the used NEMA-36 steppers.

Have some other (pretty expensive) linear drives with 5:1 gearing and 2Nm- NEMA-23 steppers, which are wired 3-polar and driven with 325 Volts, where the 10x microstepping is totally accurate "stepwise" too ...]]> VDX Mechanics Mon, 12 Feb 2018 05:04:21 -0500 https://reprap.org/forum/read.php?14,809640,809896#msg-809896 https://reprap.org/forum/read.php?14,809640,809896#msg-809896
reduce micro stepping to 1/4 and then it will move as expected (and even then between pole positions the stepper may not be uniform positions)

it will of course reduce steps to 20 steps mm and your limit is 1/20 0.05mm

If you need more real physical resolution you need 0.9 degree steppers and or geared steppers.]]> Dust Mechanics Sun, 11 Feb 2018 23:23:20 -0500 https://reprap.org/forum/read.php?14,809640,809640#msg-809640 https://reprap.org/forum/read.php?14,809640,809640#msg-809640
If I try to move for example (I have tested with a dial indicator):

G1 Zx.x5

It doesn't move.

G1 Zx.x7

It moves, but for some reason it rounds to x.x+1

The command M114 shows the axis right numbers (without rouding);

I didn't found in Marlin any settings to fix this. Anyone knows how to fix this ?

So If I need layers at 0.25mm in fact they are been printed at 0.25mm]]> serandre Mechanics Sat, 10 Feb 2018 05:41:27 -0500