Mystery colour streaks - WILL PAY FOR SOLUTION

[BluePeachBread]

Hi, I am desparate and willing to pay anyone that can help solve my printer problem for me.

S3D support and Craftunique are unable to isolate despite much problem solving.

PROBLEM:
Random and slightly diagonal lines/streaks across my PLA prints.
1.5yr old Craftbot3 (CoreXY design) with moderate usage.
Problem only started recently.
Started on head1 then eventually started on head2.
Layers are about 1-2seconds long

SOLUTIONS TRIED:
Rails - lubricated
Material - swapped with fresh reel
Speed - various
Extrusion - layers all look uniform and accurately laid, only colouring seems affected
Temp - not enough time for temperature to fluctuate so consistently within or between layers
Something loose - layers all look uniform and accurately laid
Stl file or slicer - printed previously without issue

It is only a problem with these parts, because they form part of a desklamp and have light shining through them.

Thanks

[longbeardpolymer]

I forensically enhanced the photos you posted. I came to the conclusion that you do not have a consistent or repeatable machine in the position of the tool in all 3 axis. you also do not have consistent extrusion width. if you can reduce your variability and increase repeatability in all areas then you will be closer to your goal. basically all the motion control systems + extrusion have noise. not electrical noise. it could be electrical but I mean you have noise in your movements. tolerances add together. count the number of moving parts + bolted on parts. you just can't do what you want on that machine. you need to upgrade it in every possible area so basically a new machine.

although, I do think that the parts look good. I think you are trying to push the machine beyond what it was made for. you should be focused on light diffusion not on 3D printers. you may find that diffusion material or post processing completely solves the problem. these high quality materials are available for cheap in the OEM quantity because they are used in the manufacture of LCD TV or computer monitors. I make my own paints, I would be reaching for the fumed silica of a specific micron (particle size). then I would find a binder that is chemically compatible with PLA. wear a respirator with silica powder. research maximum pigment loading of the binder or adhesive you have chosen.