Not printing the right size

I am finding my parts are printing too small and can't see to get it fixed. I am trying to make the MPCNC Allted released on thingi [www.thingiverse.com] and I am finding the parts are way too tight. I am off about .6 mm on the outside and inside when I print a tube such as the parts to attach the machine to a table so the piece of conduit won't fit in there without a ton of sanding.

I have checked when I move X and Y 100mm it moves 100mm. I have a .6 mm nozzle and when I print a single wall I get .6mm

I have tried messing with the extrusion multiplier and saw no change.

The only thing that seems to change anything is re-sizing in repetier host.

What's the fix for this? I am searching and trying everything I can find with no success.

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Newbie with Folgertech 2020 i3.

You might get a single wall of 0.6mm but in normal printing your extrusion width will always be higher.
No fit at all means you are extruding too much, so a decent calibration for infill, perimeters and extrusion multiplier would be a good starting point.

so you printed calibration cubes ie 20mm x 20mm x20mm you know if theres anything wrong with your axis, use the prusa calculator to work out what adjustments you need to make in the firmware

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Check my rubbish blog for my prusa i3

up and running
[3dimetech.blogspot.co.uk]

Also what material? When I'm using ABS, I've found it shrinks so I have to compensate by scaling the part or temporarily modifying my steps per mm by 102%

Thanks for the replys I am back finally. I hadn't actually tried a 20x20 cube for a while. At one point I was getting 20mm but now I am also short about .4mm - .6mm in the X and Y dimensions. Is this the Prusa calculator you mean? [prusaprinters.org] What part would I be using for this? I just see steps per mm and layer height.

The only extrusion calibration I have done is steps per mm I didn't know there were any others I will google that and see what I can find.

I am seeing the issue with ABS and PLA.

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Newbie with Folgertech 2020 i3.