自制探测器模块：适用于Ender 3 Pro

DIY Probe for ender 3 pro

2023-08-26 22:24:27

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Summary

modified version of https://www.thingiverse.com/thing:2841443 to fit my ender 3 pro with a spider hotend and an endstop recovered from an old printer and a 2mm nail insead of a carbon rod.

the accuracy I got using M48 repeatability test was not as good as the original(range 0.043, deviation 0.013) but I think it' sufficient to get a good result in normal printing conditions.

if you want to use the fan shroud it was made to fit the creality spider hotend (v2 I think) and you have to include the piece make to hit the x endstop and reduce the build area from 235mm to 225mm on the x axis (you will loose about 10 mm of bed on the x axis counting)

Post-Printing

Hardware

2 M3x14mm bolts
1 M3x8mm bolt
1 M4x16mm bolt (preferably panhead)
2 very small self tapping screws for the servo arm
2 or 3 small self tapping screws to fix the optical enstop
the screws that should be included in the servo package
3 M3 nuts
1 M4 nut
1 2mmx35mm nail (I used a 45mm nail cutted to size)

1 optical endstop (I used one recovered from an old "2d" printer)
my endstop has 3 wires
1 9g servo
1 resistor (depends on the endstop, I used 330Ω)
connectors for the printer's board

Wiring

for a creality 4.2.x board you can use the z endstop connector for the optical endstop and the bltouch connector for the servo (IN is PWM) and for the optical endstop's alimentation (through the resistor).

I don't want to give you wrong informations about wiring and risk damaging your board as your endstop might be different so you should check the exact wiring by yourself

Firmware changes

I used Marlin 2.1.x bugfix
these settings work for me

enable Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN (line ~1350)
"#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN"

enable servo probe (line ~1400)
"#define Z_PROBE_SERVO_NR 0"

set the angles on Z_SERVO_ANGLES (I used 175 and 120)
" #define Z_SERVO_ANGLES { 175, 120 }"

set the probe's offset
"#define NOZZLE_TO_PROBE_OFFSET { your, values, here }"

set the margin to avoid the bed's clips if you are using them
"#define PROBING_MARGIN 30"

enable bed leveling (line ~2000)
"#define AUTO_BED_LEVELING_BILINEAR"
"#define RESTORE_LEVELING_AFTER_G28"

Edit the model

the model was made using onshape, i used https://grabcad.com/library/mbot3d-mk2_rev2-0-ender7-style-fan-duct-1 for the fan duct and modified it to fit the custom probe and my ender 3 pro (the screws on the gantry are different from the ender 3 v2)

this is the project with the modified probe:
https://cad.onshape.com/documents/71c868b1ec692d2a2ac33bf0/w/bb23bbec8ec4239dff5f28b6/e/e2a8d28baf0522e4e42dc7a6?renderMode=0&uiState=64ea015c9549322c31a3f0c1
(the probe is in the used folder)

this is the project with the modified fan shroud:
https://cad.onshape.com/documents/3b91c81f4e50e7118519caf6/w/6fcd4f20824bf1c5297ce9ce/e/85ef98eb9222d6a67c5edc79?renderMode=0&uiState=64ea013afb084b1be0cd9645

if you want to modify it more easily check the onshape link on the original thing:
https://www.thingiverse.com/thing:2841443