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Homebrew engraver to 3D printer Mod

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efrench:
The size is probably within normal tolerances for an FDM printer.  You need to test whether the extra material is a hardware issue or an extrusion issue.  If it's hardware related, you can use regular machining techniques to measure it.  If it's an extrusion issue, you can experiment with different settings in the slicer software or possibly in the firmware configuration file.  Have you mentioned which slicer software you're using?

My workflow is:
Design in Fusion 360.
Slice in Slic3r.
Print (Smoothieware clone).

BillTodd:
I am using Cura atm (still running xp so  choices are few) 

Thinking about the size error. It is small but it would be handy to reduce it. I feel there could be a small amount of mechanical error : the timing pulleys are plastic and belts could stretch a little . But I suspect it might be 'tracking' or the spread of the extruded filament , and thus a fixed error rather than accumulated . I'll have to print a bigger cube (or square) to find out 

Pete, your laser project sound interesting ( I've watched a couple of Marco Reps videos on youtube , where he has used a 3dprinter fitted with uv laser to make PCBs). We have a couple of laser engravers at work (and a 3kW cutter) for metal marking that use 20w scanning beams - It'll be interesting to see what your machine can do :-)

BillTodd:
well, 4 hrs into a 12hr print of the engine base (now wishing I'd have spent more time tidying up the internal faces as every little nook and cranny needs a million movements to print!

BillTodd:
Ha it worked :)

BillTodd:
Well the engine works  :D

Needs a few mods tonthe clearances still but it works!

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