MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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Are you using PLA or PETG? I have found they don't work so well with PLA. PLA is too stiff, and looses its bite quickly, causing them to not stand out. PETG seems a little more slippery to me for assembly, but holds its bite longer. I also think the .3mm layer height adds deeper ridges, letting them lock together better. A brim could also make them harder to snap together, make sure to get all the brim completely off.

I print them with at .3mm layer height, with a .2mm initial layer. They also really don't need any infill.