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SonOfHumber

Anet A8 18mm Rear Mount Sensor Bracket

by SonOfHumber Feb 15, 2017
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could you provide the updated settings or the files?

THE BAD HOLDER EVER for ANET A8 dont print it guys.

Much much problems for this holder look at pictures please, IMPOSSIBLE to adjust the autolevel.

sorry it doesn't work on yours. works perfectly on my setup.

My Xstop is different than yours

Hi there, i am using this plate on my anet a8 with stock firmware and autolevel support and the LJC18A3-H-Z/BX.
Does anybody have a tutorial to get it correctly work on anet a8-l stock firmware?
best regards

I discovered another issue. In order to get the probe low enough to be able to trigger I had to raise my print head but now the nozzle sits higher than the stock fan duct so when Z=0 and the head moves from the side of the bed onto it the nozzle catches the edge of the glass and pops off. I think if you could lower the top circle section by 10mm maybe it will allow for the sensor to be mounted lower...

yea, you shouldn't need to move nozzle. I will create another version this evening that has a shorter neck. sounds like your sensor may be shorter than mine.

Its 70mm long with the highest threaded part at around 57mm. I think the addition of glass on the bed forces one to move the nozzle higher to prevent impact...

just added a shorter neck version.

I get a compile error when I try to use the offset settings. It tells me "The given FRONT_PROBE_BED_POSITION can't be reached by the Z probe."

check the travel limits...

// Travel limits after homing (units are in mm)
'#define X_MAX_POS 219
'#define X_MIN_POS -30
'#define Y_MAX_POS 220
'#define Y_MIN_POS -5
'#define Z_MAX_POS 230
'#define Z_MIN_POS 0

I also attached the config.h file which you could load as well.

Thanks. If the auto-level grid isn't in the middle of my bed, how do I correct that? Also how do I configure my printer so that X=0 Y=0 is where I want it to be on the actual print surface. At the moment that spot is X=20 Y=10.

The printer head knows where it is once it finds the endstops. the code above tells it where those endstops are relative to the bed. the "X MIN POS -30" is telling the machine that the endstop is at -30, so x=0 is 30 in the other direction. Same goes for the other end stops. After you do the G28, you could try sending G1 X0 and see if X0 is the edge of the bed. If it doesn't then you may need to adjust X MIN POS by that difference. Hope that makes sense.

Skynet actually sends the sensor to the middle of the grid, not the nozzle, when you "home all". when i was doing this a couple of weeks ago I was expecting the nozzle to go to the middle of the bed, but then realized it was sending the sensor the the middle.

Im still basically a newb at all of this but I will continue to try and help as much as I can.

Thanks, I think it's starting to make sense now. Based on that I settled for the below settings. From X=0 Y=0 I can basically travel to a max of X190 Y180 which then covers my build area and due to the FRONT_PROBE_BED_POSITION I can't probe any closer to the front edge.

// Travel limits after homing (units are in mm)

define X_MAX_POS 240

define X_MIN_POS -50

define Y_MAX_POS 205

define Y_MIN_POS -25

define Z_MAX_POS 230

define Z_MIN_POS 0

// Set the boundaries for probing (where the probe can reach).

define LEFT_PROBE_BED_POSITION 10

#define RIGHT_PROBE_BED_POSITION  180
#define BACK_PROBE_BED_POSITION   180
#define FRONT_PROBE_BED_POSITION  40

Awesome thing!
Works perfectly with the stock Anet A8-L firmware, which supports Auto Leveling.
No problems on the X-Axis without the washers.

Stock Firmware:
http://anet3d.en.made-in-china.com/custom-detail/xmQExQndGJUQxmQExQndGJUQ/The-Firmware-Links-You-May-Need.html

Tried Skynet3D with "mainstream" front sensor mount => constantly crashing into bed.

I like the idea of having the probe at the back. I printed it but on my A8 this mount prevents the X travel from reaching the endstop switch by about 10mm.

If you use any washers remove them.
Initially I also thought it was the mount itself.

No I didn't use any washers, just mounted it straight to the back of the blocks. The outside of the circle was coming into contact with the bottom support plate.

Thats interesting. I wonder if our frames are slightly different. On mine it gets close, maybe withing 5mm to hitting the frame, but no issues hitting the x end stop. you might could design a piece that causes the triggering of the x end stop sooner. not sure.

I thought about that but then I found this part - http://www.thingiverse.com/thing:1883473 . very basic but will work for now just to test the sensor out.

Anet A8 bed level holder (18mm capacitive sensor)
by LucaCap

cool. I am going to see if i can rework my first iteration. I think there is some room for improvement which may eliminate the contact with the frame.

I added a different version that might be able to help. tightened up the radius of the circle where the sensor sits in. also removed a bunch of material in the middle.

Thanks, I'll give it a try. Looking at where you removed the material I think this one might work...

Nice mount. Looks robust and seems like it would be much less prone to being disturbed when loading/unloading filament or doing other work on the hot end - I'll definitely give it a go. Would be cool if you could post the X/Y offsets for the configuration file.

X_PROBE_OFFSET_FROM_EXTRUDER 20
Y_PROBE_OFFSET_FROM_EXTRUDER 65
Z_PROBE_OFFSET_FROM_EXTRUDER 0

i built this before i got sensor. after I get it all mounted I will post the offset. or maybe you can beat me to it.

Ho much infill did you use ?