rear side of the part printed with a better quality than the front side  

RE: rear side of the part printed with a better quality than the front side

Apology, that post should  go to he MK3 forum

RE: rear side of the part printed with a better quality than the front side

Rotate the part and see if the issue moves. If so, check your cooling duct and fan.

Some of that distortion is ringing, caused by abrubt changes in motion. in which case simply slowing down -- particularly external perimeter speeds -- can help. I use 25mm/s for external perimeters if I'm concerned about finish. Jerk and acceleration settings can help as well. 

RE: rear side of the part printed with a better quality than the front side

Thank you bobsro for the suggestions.

I rotated the  object 90 degrees along the Z axis and reduced print speed to 75%. There  is some improvement.

I suspected some belts tension problem but both X and Y belt tensions are within the specifications range.

Jacques

RE: rear side of the part printed with a better quality than the front side

Final result after rotating the part 90 degrees around the Z axis, speed and acceleration reduced to 50% .

The object is 1/120 scale  measuring only 50mm x 20 mm x 10 mm

I think  ( I might be wrong here )  I can hardly do any better with a FDM printer .

Thank you  for the help.

Jacques

[img] [/img]

[img] [/img]

RE: rear side of the part printed with a better quality than the front side

I found that slowing my external perimeter speeds to 25mm/s while keeping my other perimeters at 60mm/s keeps ghosting down. You can go at full speed for infill and non-printing moves. I also reduce top infill to 20mm/s. I've got some sample profiles you're welcome to try out. Experiment around a bit and you should be able to build a print settings profile that works well for you.

Your parts look great! Is 1:120 N gauge? I had an N gauge set as a kid. Later I bought a nice Marklin Z gauge set, but that was stolen.

RE: rear side of the part printed with a better quality than the front side

bobstro, thank you for the link to yours sample profiles but unfortunately I don't use  the Prusa slicer.

Yes, the scale is TT9mm ( 1/120 scale running on N scale track ) to simulate  the prototype running on metric gauge tracks.

I model the  Belgian vicinal steam tramway circa 1930. Of course there is nothing commercially  available so  all the rolling stock bodies are 3D printed. The chassis  are from Fleischmann piccolo ( wagons ) and Bachmann  MDT plymouth switcher for the tramway.

Here is a picture:

[img] [/img].