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Love this case, I've printed 5 sets (top and bottom) so far. Maybe 6?

I'm trying to edit/remix this, and on top of the fact i don't know what I'm doing, I'm not having much success. I can get OpenSCAD to import the STL, but it's effectively just a blob; I can't edit any parameters or see what shapes you used. So, I would have to retro engineer everything.

I tried opening the STP in OpenSCAD and I don't think OpenSCAD can open STP files.

I tried opening the STP in Netfabb and nothing happened.

What program should I use to edit this? My intent is to modify it for use with an ODROID C1+.