... in the past Just keep us all up to date with your progress as usual Rob posted: 28 Nov 2018 01:30 from: Andrew Barrowman Hi Martin, If you can create Gcode, that's great. I typically use Netfabb Basic to repair the STL for Slic3r. Slic3r does have a repair option but it doesn't always work for me. BTW, there's a good chance your printer will run under Repetier-Host. You can download it now and see how the printer will lay down the filament, like this: 2983_271947_000000000.gif The file sizes seem about right. For my 7 inch track panel: STL from TCpro 1.4 MB STL After Nefabb repair 1.4 MB Gcode from Slic3r 1.37 MB Filament required 621 mm I believe your STL files are larger because of the number of facets, but that's not really a problem if the STL compiles to Gcode. The major difference in filament length is probably because my sleepers are only 0.9 mm thick and they not very dense. Repetier-Host tells me my panels will print in 23 minutes but the estimation is ...