Anet A8 SN04-N Auto Leveling Sensor Bracket by JMadison

Last crawled date: 3 years ago

This is a rework of http://www.thingiverse.com/thing:2019216 . This version adds additional cable management, a holder for the not-easily-accessible sensor nuts, and a design that uses the 8mm linear slider bearings to align the bracket. If you’re using a full cooling fan ring you’ll need to move to a half ring: http://www.thingiverse.com/thing:1954001
Sliced using Cura with the standard Anet A8 settings. The bracket used the normal profile, and the nut holder used high quality.
Standard Anet A8 Cura settings can be found in the comments section of the setup video: https://www.youtube.com/watch?v=gSXFHd-UDmE
The Marlin Configuration.h settings:
I determined these offsets using the grid file "Coords mm.pdf"
define X_PROBE_OFFSET_FROM_EXTRUDER -11 // X offset: -left +right [of the nozzle]
define Y_PROBE_OFFSET_FROM_EXTRUDER 31 // Y offset: -front +behind [the nozzle]
The Z_PROBE_OFFSET_FROM_EXTRUDER setting should be set based on your actual results during setup. See https://www.youtube.com/watch?v=tTl09r-E0wE . Note that the video uses Cura. I wasn’t able to get Cura to see the Anet board on my Mac so I used the Repetier-Host Mac.app.
define Z_PROBE_OFFSET_FROM_EXTRUDER -0.6 // Z offset: -below +above [the nozzle]
Update: See the comment from T3rorX. T3rorX has found the bed position settings I provide below to not be optimal. I'm no longer using this sensor so I'll let you decide which to use.
I was kind of iffy on these 4 settings:
define LEFT_PROBE_BED_POSITION 15
define RIGHT_PROBE_BED_POSITION 195
define BACK_PROBE_BED_POSITION 205
define FRONT_PROBE_BED_POSITION 25
Hardware: (2) M3 x 25, (2) M3 x 20. (It will work with longer versions of either, these are the exact sizes.)
Make sure you use thread locker such as https://www.amazon.com/gp/product/B000I1RSNS. I found that the sensor screws will loosen causing the sensor to drift closer to the bed if it's not secured tightly. When this happens it shows up as poor first layer adhesion.
I got the SN04-N sensor on eBay. There’s a huge range in price depending on whether you buy it with or without the connector. I got two for US $7.42 (from a US vendor) and added the connector myself. It came out cheaper than some of the assembled sensors, and you end up with a useful crimping tool for XH2.54 and JST 2.0 PH connectors.
Sensor: http://www.ebay.com/itm/351861131683
Connector: http://www.ebay.com/itm/252489099827
Crimping tool: https://www.amazon.com/gp/product/B00YGLKBSK