My first job since building my Prusa i3 has been to print replacement parts for my Prusa i3 as I'm not especially happy with the quality of the ones I purchased but I'm having issues with the X-Axis Motor mount - I'm using the Rework version. At exactly the same point in the print 1 hour 40 ish minutes the last 4 times I've tried to print it it has skipped off to the right by a couple of mm. On one attempt I let it almost complete before stopping it and it the remaining layers were perfectly in line with the new position.
I've got motors that are 68oz-in @ 1.2Amps and the motors are cool to the touch at all times. The stepper drivers are a4988's set to 1/16th steps and are putting out just under 1.2A I've got heatsinks on the chips and a 40mm fan blowing over the whole ramps board. So I don't think it is the stepper motors or drivers overheating and if it was mechanical then why does it only happen once during the print ?
I've been using Pronterface & slic3r on a Mac but printing from an SD card. I tried reslicing it for this last attempt but still exactly the same fault and as I had "Randomise starting points on" it is a completely different set of gcode instructions this time which should in theory reduce the chance of it being resonance related. I've just started attempt 5 with some different settings in Slic3r ... I've removed the "Randomise starting points" option in the hopes that this may avoid some of the long travelling movements, and I've reduced the travelling speed from 130mm/s to 60mm/s.
Can anyone help shed some light and point me to some other things I can try ?
I've got motors that are 68oz-in @ 1.2Amps and the motors are cool to the touch at all times. The stepper drivers are a4988's set to 1/16th steps and are putting out just under 1.2A I've got heatsinks on the chips and a 40mm fan blowing over the whole ramps board. So I don't think it is the stepper motors or drivers overheating and if it was mechanical then why does it only happen once during the print ?
I've been using Pronterface & slic3r on a Mac but printing from an SD card. I tried reslicing it for this last attempt but still exactly the same fault and as I had "Randomise starting points on" it is a completely different set of gcode instructions this time which should in theory reduce the chance of it being resonance related. I've just started attempt 5 with some different settings in Slic3r ... I've removed the "Randomise starting points" option in the hopes that this may avoid some of the long travelling movements, and I've reduced the travelling speed from 130mm/s to 60mm/s.
Can anyone help shed some light and point me to some other things I can try ?
