xy size compensation for EM 2 pro

[cliffyk]

I printed this last evening using a 50/50 mix of Siraya Tenacious and some cheap LAFVIN Standard Gray "ABS-like" resin:



It's a 20 x 20 x 25 mm step block with (5) 5 mm steps. Here's an analysis of the dimensions both before and after final curing:



As you can see, post final curing (it grew a bit), the maximum error was-1.20% at the height of the 3rd step.The block is as square in all planes as my 3" Starrett machinist's square can reveal. It has a 0.35 mm or so "elephant foot", easily removed with a triangle scraper or file.

For a $344  hobbyist level machine ($200 for the printer and $144 for the Z-axis mast upgrade) I cannot/will not complain about that level of accuracy. FWIW I suspect the Jackson mast has a whole lot to do with these results.

My next step is to clamp it in a vise and whack it with a 16 oz. ball peen to see how it stands up--I'll post photos once that's done...