I have a new Ender 3, it was printing fine using the Ultimaker Cura 4.1 slicer. I printed about 1/2 a roll of blue 1.75 mm filament through a 0.4 mm nozzle. All my prints were Ender 3 mods (plus one cover for a device I had).
Then it stopped printing 1/2 way through printing a bracket for the Y-axis to allow for a damper.
After several days of under extruded parts that I aborted I discovered that the extruder motor was stopping intermittently and that turned out to be a bind in the motor. I replaced the motor, but it continued to under extrude. I replaced the stock extruder feed with Anpro Upgrade, MK8 Extruder Aluminum Alloy Block Bowden Extruder 1.75 mm Filament for Creality 3D. The same problem remained.
I did the extruder test with 120 mm marked on the filament and only about 60 mm went through.
By increasing the flow to 150 % I can print usable parts, but that seems like a bandaid covering up the real problem. Of course, I have cleaned the hotend, changed the nozzle and the feed tube.
I have assumed that during the feed test of 100 mm you should preheat the nozzle before the gcode
G1 E100 F100 ; Extrude 100 mm at 100 mm a minute is issued.
Is there any point in removing the nozzle or the feed tube and issuing this 100 mm/100 mm command?
I have ordered a new hot end, but I'm beginning to suspect the board itself is not feeding correctly. Help?
I removed the Bowden tube from the hot end and issued the 'G1 E100 F100` and it feeds exactly 40 mm. Do I possibly have a second bad motor? I currently have no way of modifying the code on the board. Is there a factory reset for the Ender 3?