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Dimension accuracy issues with S5

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I'm vetting my newly-acquired S5 and having some serious accuracy issues.


I have a simple Lego cap (hollow rectangular prism with solid top), 8mm x 24mm external, 1.6mm walls. You know; Lego.


On my MakerGear M3 with its default settings I get a print in about 12m, and it's almost exactly 8mm x 24mm.


On the S5, *after* some deburring and sanding, it's 8.3mm x 24.2mm. Wall thickness is 1.7mm.


I'm running the stock AA 0.4 print core, still on the spool of 3mm filament that came with the printer. For comparison, the M3 is running 3.5mm.


Is this the kind of accuracy I can expect? 0.3mm is pretty far off (IMO, anyway; perhaps I've been spoiled). I'm trying a new print with a smaller layer height and less infill to compare, just in case, but it's already ~%30 slower than the M3. 


Let me know what else you'd like to know, I've attached the STL if anybody cares.

Lego 1x3 Spacer (Topless).stl

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