Show 3 decimal places for Z babystepping

[JoePrints]

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Description

Change in menu.cpp to modify babystep Z displayed coordinate with 3 decimal places (0.000) using Prusa style display format

Benefits

Improves readibility

Related Issues

Z babystep value shows only 2 decimal places (000.00)

[InsanityAutomation]

I'll compare to the other instances, however most use points determine decimal to show based on limits. Default offset limits this will overrun the variable.

[thinkyhead]

Since ftostr43sign only works for values between -9.999 and +9.999 the question is:
Does Marlin need to support Z babystepping offsets of 10 and higher?

[InsanityAutomation]

We have examples in the Delta category such as the coastal where this needs to be quite high

[thinkyhead]

I see that other places in Marlin are using LCD_Z_OFFSET_TYPE as the menu edit type. This is float43 (ftostr43sign) when the probe offset range is -9.999 to +9.999, and float52 (which uses ftostr42_52) when more digits are needed.

[InsanityAutomation]

Yeah, we did that a few months ago. That's exactly what I was intending to look for tonight.

[thinkyhead]

Looks like the macros should be changed to match…

#if Z_PROBE_OFFSET_RANGE_MIN >= -9 && Z_PROBE_OFFSET_RANGE_MAX <= 9
  // Only values from -9.999 to 9.999
  #define LCD_Z_OFFSET_FUNC(N) ftostr43sign(N)
  #define LCD_Z_OFFSET_TYPE float43
#else
  // Values from -99.99 to 99.99
  #define LCD_Z_OFFSET_FUNC(N) ftostr42_52(N)
  #define LCD_Z_OFFSET_TYPE float52
#endif

And then the menu item should be…

MenuEditItemBase::draw_edit_screen(GET_TEXT(MSG_ZPROBE_ZOFFSET), LCD_Z_OFFSET_FUNC(probe.offset.z));

[thinkyhead]

Ok, I've updated this to consider regular Z probe offset editing outside of babystepping and regular babystepping outside of editing probe offsets.

Now I'm in the mood to change babystepping configuration to use mm instead of a step multiplier, because the Prusa solution ("calculate ideal babysteps") feels like a bread sandwich.

[InsanityAutomation]

I smell a sanity check coming on to make sure that the enter distance matches up to steps....

[Grogyan]

There are those that use small nozzles, and 10um resolution in baby stepping may be too low, and need an extra DP of precision for Z offset, and bed besh calibration