Store and display FT_MOTION linearadvance as a float with 4 digit and 2 decimals

[narno2202]

Description

As reported by users, linearadvance value in FT_MOTION is a 10E-6 value. Setting via M493 is correct but the reported value is not correct and is impossible to set via FT_MOTION menu.
With this PR the value is shown and stored as a float with four digit and 2 decimals, the real linearadvance value is processed in ft-motion.cpp .
The menu is updated accordingly.

Requirements

FT_MOTION enbaled

Benefits

Linearadvance value can be et via menu, M493 and reported correctly

Configurations

Related Issues

[grizzleeadam]

Wanted to give some feedback on this. I've got a pretty much stock Ender 3 Pro (SKR Mini E3 v1.2 board) with the stock bowden tube and have been playing around with FT Motion today (using your FT-Motion Print Menu branch as of 2/17/24)

Using 2500 acceleration, and MZV shaping tuned, my K-factor is best around .024. (Used the Marlin K-factor calibration generator, replaced all the M900 commands with M493.)

Other variables that may have an effect: using JD at .14, edge_stepping on, s-curve on, stealthchop enabled.

I'm not sure if your .000006 value is from a direct drive extruder? Would be good to have the multiplier be fair for both direct drive & bowden setups - maybe a 10e4 multiplier with 2 decimals?

[narno2202]

You are the third user reporting a K factor value. So, this is the first range of values. I change the code accordingly.