My dual head K8400 is printing everything too small. A 100 mm thingie comes out at about 99.2 mm. holes are of course always too small as well by about .6 mm. Prints come out very neat, but just too small overall. Trying to compensate with horizontal expansion and hole expansion in Cura just deforms the whole design.
I also tried adjusting the belt tension, but to no effect.
Should I adjust something in the firmware?
Are there any tips on this? All help is much appreciated!
And if you don’t want to change your steps/mm from g-code or Repetier Host or the LCD screen or if the firmware doesn’t give a response to an M503 gcode, you can scale the model on the X and / or Y axes before slicing under cura.
Hello PPAC,
Thank you again for the link to the wiki.
I checked all the voltages at the upper register of the 0.89 - 0.925 V range. All except for extruder #1. I set all to be 0.924 / 0.925 but found no change in the result in the dimensions. The adjustment the extruder board did seem to solve another issue though, where the temperature of the extruder didn’t get back up high enough to continue printing after the other extruder did its part of a layer.
I must say I also added a 15 Ohm resistor to the 10 Ohm resistor on the pcb on the top, that the heater, temp sensor and coolers connect to.
I’ll try to hook up the printer to Repetier now. See what M503 says.
cheers, Wilco
@Wilco, indeed as “PPAC” says, you can switch the stepper drivers to see if problem shift, or solved with replacing for that axis.
But Sometimes it happens that the “Stepping Mode” are changed due a internal defect in DRV8825 IC (Stepper driver IC). If this happens, the speed can be slower or goes faster than other stepper motors.
Hi,
Well, I switched around the stepper boards, and found no changes whatsoever. So either all boards are faulty, or none are.
At the moment I have doubts that the boards are the problem. Would in that case not a large object have a larger error? If the size difference is 1%, it is one mm on 100 mm, and one hundredth of a mm on 1 mm. But the error is always about 0.25 mm. So my 100 mm is 99.5 mm, and my 5 mm is 4.5 mm.
Oh, and both in X and Y. no idea about Z.
I have experimented a lot with Cura settings horizontal expansion and horizontal hole expansion, but found no solution with it. Horizontal expansion also closes the holes further, and countering this with horizontal hole expansion disforms the whole thing.
I tried connecting directly to Cura and repetier host, latest versions on OSX Big Sur. Cura can control, but doesn’t show respons on the screen, and repetier says it’s connected, but doesn’t understand the printer. So no results with gcode commands yet. Should I try a windows machine for that?