Prusa Mk3s Extruder setup for Linear Rail MGN12H Ender 3

thingiverse

So, I wanted a direct drive extruder setup and i was not happy with the one available and wanted something like I have on my Prusa. I left the features for the filament runout sensor, but if you don't use one it won't be a problem (I don't). I also went the "while i'm there route" and went with a MGN12H linear rail because it was simple to add to the extrusion with just bolts and T nuts and I wanted to keep the original extruder parts non modified for backup. I upgraded to linear rail on X-Axis, used sensorless homing on my TMC2130 and designed this adapter plate, going sensorless was less headache for me than modifying more hardware. You will need plenty of M3 screws, i ordered a kit from amazon and did not note what I used. Other things to get : - E3D V6 hot end - MGN12H Linear rail (300mm) - Inductive sensor - Steel build plate (for mesh bed levelling) - sensorless homing, otherwise you need to design something for the X limit switch to work - bondtech gear - You can use the stock extruder FAN, but I use the 5V noctua and power it with a LM296 module. The extruder steps per mm are now 140steps per mm (and not 96 like the regular extruder) make sure to make this change in marlin too. Here is a link to my CAD on ONshape https://cad.onshape.com/documents/c8898aacdc669d63ed11febf/w/de1ac0c83b01cef0053b70af/e/fb0c02672a3931545f7354b7 The source documents (MK3s) were taken from grabcad at : https://grabcad.com/library/prusa-i3-mk3-solidworks-1 I got my inspiration from : https://www.thingiverse.com/thing:3719561 but I wanted a MK3s version and I wanted it to be mounted on My MGN12H rail. I remade the whole design but I will use Remix for credits to him. All extruder parts are the stock prusa ones exept the extruder body, I changed it to add three holes for better rigidity with the base. a E3D V6 hot end is required, and you will also need a Steel Springsheet build plate if you want to use the inductive sensor like me. Have fun. PS: I'm thinking of a version that I could change the belt adapter to include a cable shroud (a bit like on the prusa) which would make the wire management easier. Some part references : Thermistor : https://www.aliexpress.com/item/32847452724.html?spm=a2g0s.9042311.0.0.de144c4dsMuuyT Heater cartridge : https://www.aliexpress.com/item/32815934251.html?spm=a2g0s.9042311.0.0.de144c4dsMuuyT Hot end : https://www.aliexpress.com/item/32844313509.html?spm=a2g0s.9042311.0.0.de144c4dsMuuyT Bondtech Gears : https://www.aliexpress.com/item/32907327548.html?spm=a2g0s.9042311.0.0.27424c4d6vliJs Inductive sensor : https://www.aliexpress.com/item/33006152423.html?spm=a2g0s.9042311.0.0.de144c4dsMuuyT Textured Steel build plate : https://www.aliexpress.com/item/33006756328.html?spm=a2g0s.9042311.0.0.de144c4dsMuuyT MGN12H Linear Rail : https://www.amazon.ca/gp/product/B07XT8ZY9H/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1 i'm using an SKR PRO 1.1 : https://www.biqu.equipment/products/bigtreetech-skr-pro-v1-1-32-bit-control-board but anything running marlin should be good ;) I'm just a finite STM32 fan because I use them so much at work and they are awesome MCUs compared to anything I have worked with. I recommend using PETG at 40-50% infill. No need for supports