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I have a Prusa i3 that homes properly when you use the menu. After adjusting the bed and homing several times it keeps the head at a reliable distance. However when I try to print from SD card, the printer buries hot end in the heat-bed.

What needs to be adjusted to fix this issue?

gcode from one of the 2 files

M190 S50.000000 M109 S200.000000 ;Sliced at: Mon 13-06-2016 15:39:25 ;Basic settings: Layer height: 0.2 Walls: 1.2 Fill: 20 ;Print time: 3 hours 47 minutes ;Filament used: 11.435m 34.0g ;Filament cost: None ;M190 S50 ;Uncomment to add your own bed temperature line ;M109 S200 ;Uncomment to add your own temperature line G21 ;metric values G90 ;absolute positioning M82 ;set extruder to absolute mode M107 ;start with the fan off G28 X0 Y0 ;move X/Y to min endstops G28 Z0 ;move Z to min endstops G1 Z15.0 F3000 ;move the platform down 15mm G92 E0 ;zero the extruded length G1 F200 E3 ;extrude 3mm of feed stock G92 E0 ;zero the extruded length again G1 F3000 ;Put printing message on LCD screen M117 Printing... ;Layer count: 446 ;LAYER:0 M107 ;LAYER:1 M106 S127 G1 F2400 E-4.50000 G0 F3000 X81.474 Y58.603 Z0.300 ;TYPE:WALL-INNER G1 F2400 E0.00000 G1 F2220 X83.063 Y56.456 E0.06663 G1 X84.277 Y55.080 E0.11240 G1 X84.836 Y54.444 E0.13353 G1 X85.799 Y53.476 E0.16759 G1 X86.755 Y52.587 E0.20015 G1 X87.179 Y52.244 E0.21376 G1 X88.836 Y50.911 E0.26680 G1 X89.285 Y50.610 E0.28029 

1 Answer 1

You didn't share much details, which is problem with any question. But let me give some recommendations - I have Prusa i3 MK2 1.75mm.

The fact that it homes correctly does not at all mean that your Y axis is OK.

  • Verify that PINDA probe's bottom end is maximum 1 millimeter above the extruder head.
  • Double check that PINDA probe is correctly screwed and does not wiggle.
  • Manually check that the printer does not allow you to toutch heatbed with extruder, follow these steps:
    1. Wait for both heatbed and hot end to cool down.
    2. Put paper sheet on heatbed
    3. Go to Menu - Settings - Move Axis - Z Axis
    4. Move the axis down. If hot end toutches and presses on the paper, the calibration is not OK at all.
  • Updating your firmware can't hurt if you didn't do it already.

If this advice does not help you, please update the question to address the following questions:

  • How does your G-code beginning work? Ideally, share some short G-code, I could easily check whether it is correct with my printer.
  • Does XYZ calibration pass correctly in your printer?
  • Take a picture of your extruder so that both PINDA and extruder are visible