Oversized printing with G2S

[acozzy]

Hello guys , i think i found what causing the issue..when im printing i've noticed hotend moving like in a bowl! so edges are not near to the hotbed.

Lets say i manually move to the x0 y0 z0 no problem between hotend and nozzle 0.8mm. but when i x50 y50 z0 its like 3mm between the nozzle and hotbed.

I found something related to this issue in the firmware , it's called

#define ACCURATE_BED_LEVELING

#ifdef ACCURATE_BED_LEVELING
#define ACCURATE_BED_LEVELING_POINTS 5
#define ACCURATE_BED_LEVELING_GRID_X ((RIGHT_PROBE_BED_POSITION - LEFT_PROBE_BED_POSITION) / (ACCURATE_BED_LEVELING_POINTS - 1))
#define ACCURATE_BED_LEVELING_GRID_Y ((BACK_PROBE_BED_POSITION - FRONT_PROBE_BED_POSITION) / (ACCURATE_BED_LEVELING_POINTS - 1))

// NONLINEAR_BED_LEVELING means: don't try to calculate linear coefficients but instead
// compensate by interpolating between the nearest four Z probe values for each point.
// Useful for deltabots where the print surface may appear like a bowl or dome shape.
// Works best with ACCURATE_BED_LEVELING_POINTS 5 or higher.
#define NONLINEAR_BED_LEVELING
#endif

#endif

but this is useful according to the explanation just for auto leveling..since i can't do auto leveling i need to do manually..

How do we adjust the print surface may appear like a bowl ??? Please help me

[Mark]

How about manually adjust the 3 screws on the hotbed to cover it ?

[acozzy]

Hi Mark,

thats exactly what i am doing already. I can't do autoleveling since its not working but even though i adjust the screws, when im x0 y0 z0 touching sides are not touching to the hotend when i move.i have the bowl shape..when i move from 0 poin to the 50 or -50 hotend moving up little bit on the sides.

So what i am asking how to eliminate this bowl movement

[Mark]

I found a solution to this that you need to modify the DELTA_RADIUS .
(For each 1.0 unit increase or reduce of the DELTA_RADIUS, the z printing volume will increase or reduce 0.2 unit)

#define DELTA_RADIUS (DELTA_SMOOTH_ROD_OFFSET-DELTA_EFFECTOR_OFFSET-DELTA_CARRIAGE_OFFSET+2.0）

*If the nozzle touches the center point but not the around points, that is a convexsurface, you should reduce the DELTA_RADIUS from 2.0 to 1.0 for example.
*If the nozzle touches the around points but not the center point, that is a concavesurface, you should increase the DELTA_RADIUS from 2.0 to 3.0 for example.

You may have to adjust this for many times to keep the center point and its around point in one plain. (the distance between the nozzle and the print bed).
Modify it in the firmware and upload, test again.