Every thing i print in pla+ has been pretty dimensionally accurate on my K1c. However when i print the same thing in pa6-cf. (all fillament sunlu) the dimensions end up slightly smaller and the tolerances are arguably too tight. Magazines dont slide in and out easily, mag catch barely fits and wont slide. Pin holes are too small. Etc.
How would i address this. As it seems filament dependent not printer issue
Calibrate with a medium to large size 123 block (a rectangular cuboid with dimensions 1x2x3) and, making note of environmental factors (if you have an enclosed printer and use filament dryer, that may not matter at all), and keep it as reference to compare to your filaments. You’ll obviously need accurate calipers, but you should have those anyway. Most slicers let you set scaling per-axis. You will probably need to change the scaling in one, two, or all three dimensions (but usually at slightly different ratios) hence the 123 block, it’s easy to see which dimension needs scaling. You can literally just print a rectangular cuboid, but infill will probably have an impact on final dimensions so I recommend making/downloading a machinists gauge block, which just adds a grid of holes, usually counter-bored to be able to remain flat when used in sets of two as squares by combining with nuts and bolts.