Print not centered on the bed
I have a print that is 240x200. When I slice it in Prusa Slicer it is placed in the middle of the bed. When I print it, the print is offset to the right and to the rear. When I manually move the Core One print head to the center, the X readout says 120mm. It should be 125mm (half of the bed width of 250mm). How can I fix this? The print in the photo prints, but the right edge is at the edge of the bed. The printer really doesn't like this.
RE: Print not centered on the bed
Was the printer factory-built or from a kit?
Is the nozzle/heater block rotated to the left in the print head as it should? One may be inclined to mount it facing straight to the front, which would produce an X offset as you describe. It needs to sit centered in the gap of the part-cooling air duct.
RE: Print not centered on the bed
Or is it layer shift?
I put this test pattern on printables to exercise the whole print area of core one very quickly. Check, whether head or nozzle get stuck somewhere.
Are your belts tightened correctly?
RE: Print not centered on the bed
It understand it to be a static offset, not step loss after dynamic movement, since the OP wrote:
When I manually move the Core One print head to the center, the X readout says 120mm. It should be 125mm (half of the bed width of 250mm).
@mrporcine, I assume that offset also occurs if you do a homing (Control > Auto Home) directly before you move the axes, right?
RE: Print not centered on the bed
Yes, do a home first then move the axis. Goto to all 4 corners of the bed. If the coordinates are still off then your gantry is skewed. If it is skewed this much however, then the Y and homing calibration should fail.
RE: Print not centered on the bed
Yes, do a home first then move the axis. Goto to all 4 corners of the bed. If the coordinates are still off then your gantry is skewed. If it is skewed this much however, then the Y and homing calibration should fail.
How would a skewed gantry cause a significant offset in X?
RE: Print not centered on the bed
Interesting! After auto-homing, the center is at 125 x 110 mm as it should be. When I measured before, it was after I printed top (240x200) that reached the edge of the bed. So my steps to create the offset were:
1) Slice the top in Prusa Slicer. Printer is set to "Prusa CORE One HF0.4 nozzle". The top is 240x200mm and centered in the slicer.
2) Export the bgcode file to my computer (Linux).
3) Move the file to the printer using PrusaLink. Check the box that says start the print after uploading.
4) Push the Print button on the printer.
5) Remove the print when it's finished, then manually center the nozzle. The photo I posted previously is of the print before removing it from the bed.
I am puzzled more than ever!
And before someone notes that I can move the file directly from the slicer to the printer, this worked two days ago but is for some reason is broken now.
RE:
Yes, do a home first then move the axis. Goto to all 4 corners of the bed. If the coordinates are still off then your gantry is skewed. If it is skewed this much however, then the Y and homing calibration should fail.
How would a skewed gantry cause a significant offset in X?
I suppose it wouldn't create that much offset. Mine is skewed -0.15° which is around 0.7mm over the length of the bed. It's measurable though.
In the very beginning of finishing my build I convinced myself that the belts had to be a "perfect" 98/92hz and severely bent the gantry by 10mm. I didn't notice until my squares started looking like a rhombus.
RE: Print not centered on the bed
I put this test pattern on printables to exercise the whole print area of core one very quickly.
Thanks for the link. I printed it using the same steps as above except that I checked the "start print" box before I uploaded the file so the printer started immediately. The printer did a homing calibration before it started the print. And the print finished correctly centered on the bed.
I'll try printing just the first layer of top and see if the offset reappears.
Was the printer factory-built or from a kit?
Is the nozzle/heater block rotated to the left in the print head as it should? One may be inclined to mount it facing straight to the front, which would produce an X offset as you describe. It needs to sit centered in the gap of the part-cooling air duct.
The printer is a kit. At the same time I think you are wrong about heat block rotation affecting offset. The heat block rotates around the nozzle, so the nozzle stays in the same location no matter which way the heat block is facing.