A direct drive carriage for the Anet A8 (or other 8mm rod 45mm space i3 style machines) mounting an E3D v6 or clone hotend and a block style (stock???) inductive sensor.
Why this one?
Fanduct is a minor modification of the one found on the Prusa I3 Mk3 Full credit to Prusa Research on this one.
The motor is mounted inline with the top belt not well above the rails. Untested but I would presume this reduces wobbling with the cheap bearings.
No lost Z height. By integrating the bottom on the extruder with the hotend mount the assembly is kept short.
Has a mount for the block type (stock???) inductive sensor instead of the more standard industrial type.
Onshape link https://cad.onshape.com/documents/06d680d4d523b2dab71f8774/w/648f26260603aefdece66f9a/e/d7376da97f74412bfc8da0f2
Sorry for the complete mess I was using this to learn cad.
12 x m4*8
Can reuse stock screws but I’ve replaced with Allan key screws
2 x m3*45 from existing extruder
3 x m3*20
3 x m3 nut
2 x m3*20
2 x m3 nut
optional c.10 mm of bowden tube
Obviously the pictures are more helpful but..
Screw back plate into bearing blocks. Loosely first then tighten up the screws sliding the carriage back and forth between each screw. If the carriage becomes stiff to move back off the screw causing it and come back after some more screws have been tightened.
Mount the sensor to the "Front Plate" as shown
Mount the hotend and optionally the bowden tube as shown
Push the retained nut up the channel in the front plate as shown. (do this now as the screws holding the assembly together will stop the nut going in otherwise)
Using the long screws from the stock extruder screw into the motor. Making sure to place the spring between the stock arm and the 2 printed pieces
Mount the fan and fan duct as shown
The belt is mount with the unjoined ends and the top unlike the stock set up as shown.
These are the relevant lines (the "/" needs removing of course)
/#define X_PROBE_OFFSET_FROM_EXTRUDER -35 // X offset: -left +right [of the nozzle]
/#define Y_PROBE_OFFSET_FROM_EXTRUDER 0 // Y offset: -front +behind [the nozzle]
/#define Z_PROBE_OFFSET_FROM_EXTRUDER 0 // Z offset: -below +above [the nozzle]
/#define INVERT_X_DIR true
/#define X_MIN_POS -39
/#define Y_MIN_POS -8
/#define Z_MIN_POS -1.1
/#define X_MAX_POS X_BED_SIZE
/#define Y_MAX_POS Y_BED_SIZE
/#define Z_MAX_POS 200
/#define LEFT_PROBE_BED_POSITION 15
/#define RIGHT_PROBE_BED_POSITION 180
/#define FRONT_PROBE_BED_POSITION 15
/#define BACK_PROBE_BED_POSITION 205
- (set up ABL https://www.youtube.com/watch?v=EcGFLwj0pnA)
- PID tune
- tune settings
Fanduct is based on the design by Prusa Research
All comments and criticism welcome