I have a TEVO Little Monster Delta printer. I've been using it with a quick fix (raising the bed level on some sides). But, that kinda gets overwhelming after some time.

The problem is that the BLtouch (and I tried 3D Touch) doesn't make the fixed bed even, even with raised sides (raising the bed level basically). No matter what I do there is always a 0.4mm difference between Y-155 and Y155. Obviously, that means prints stick to the bed on Y155 side as expected while on Y-155 it prints to air. I tried to add more calibration points but that didn't fix the problem. still same.

```
; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Tue Aug 27 2019 19:34:39 GMT+0300 (GMT+03:00)
; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
G53
M665 R155 L397.19 B155 H520 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0 ; Put your endstop adjustments here, or let auto calibration find them
; Network
M550 P"TEVO Little Monster" ; Set machine name
M552 S1 ; Enable network
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet
; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X160.00 Y160.00 Z160.00 E285.00 ; set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X36000.00 Y36000.00 Z36000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X2000.00 Y2000.00 Z2000.00 E1000.00 ; set accelerations (mm/s^2)
M906 X1300 Y1300 Z1300 E1300 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
; Axis Limits
M208 Z0 S1 ; set minimum Z
; Endstops
M574 X2 Y2 Z2 S1 ; set active high endstops
; Z-Probe
M307 H3 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P25 X20 Y0 Z0.11 ; set Z probe trigger value, offset and trigger height
M557 R155 S8 ; define mesh grid
; Heaters
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4725 C7.060000e-8 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
M307 H1 A310.5 C199.7 D12.1 S1.00 V19.7 B0
; Fans
M106 P0 C"Right Fan" S1 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 C"Left Fan" S1 I0 F500 H-1 ; set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off
; Tools
M563 P0 S"Extruder" D0 H1 F0:2 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C
; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss
; Custom settings are not configured
; Miscellaneous
M500
M501 ; Load saved parameters from non-volatile memory
```

```
; bed.g
; called to perform automatic delta calibration via G32
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Thu Sep 03 2020 16:10:49 GMT+0300 (GMT+03:00)
M561 ; clear any bed transform
G28 ; home all towers
; Probe the bed at 12 peripheral and 6 halfway points, and perform 9-factor auto compensation
; Before running this, you should have set up your Z-probe trigger height to suit your build, in the G31 command in config.g.
G30 P0 X20 Y0 H0 Z-99999
G30 P1 X0 Y132.28 H0 Z-99999
G30 P2 X67.08 Y116.18 H0 Z-99999
G30 P3 X121 Y69.86 H0 Z-99999
G30 P4 X148.59 Y0 H0 Z-99999
G30 P5 X129.9 Y-75 H0 Z-99999
G30 P6 X75 Y-129.9 H0 Z-99999
G30 P7 X0 Y-150 H0 Z-99999
G30 P8 X-75 Y-129.9 H0 Z-99999
G30 P9 X-129.9 Y-75 H0 Z-99999
G30 P10 X-148.59 Y0 H0 Z-99999
G30 P11 X-121 Y69.86 H0 Z-99999
G30 P12 X-67.08 Y116.18 H0 Z-99999
G30 P13 X0 Y59.15 H0 Z-99999
G30 P14 X56.09 Y32.38 H0 Z-99999
G30 P15 X64.95 Y-37.5 H0 Z-99999
G30 P16 X0 Y-75 H0 Z-99999
G30 P17 X-64.95 Y-37.5 H0 Z-99999
G30 P18 X-56.09 Y32.38 H0 Z-99999
G30 P19 X0 Y0 H0 Z-99999 S9
G30 P20 X20 Y0 H0 Z-99999
G30 P21 X40 Y0 H0 Z-99999
G30 P22 X154 Y12 H0 Z-99999
G30 P23 X136 Y72 H0 Z-99999
G30 P24 X112 Y-106 H0 Z-99999
G30 P25 X12 Y154 H0 Z-99999
G30 P26 X0 Y-155 H0 Z-99999
G30 P27 X20 Y0 H0 Z-99999
; Use S-1 for measurements only, without calculations. Use S4 for endstop heights and Z-height only. Use S6 for full 6 factors
; If your Z probe has significantly different trigger heights depending on XY position, adjust the H parameters in the G30 commands accordingly. The value of each H parameter should be (trigger height at that XY position) - (trigger height at centre of bed)
```