Print sketchup files (STL) on makerbot
It appears that you have scaled the object after the raft and supports were added. As you can see in your photo of the raft, the clip is approximately 7/8ths (1.75/2) the size of the raft.

Edit: As a side note, STL files don't actually have a concept of units. Each axis is defined in arbitrary units. That's why when you export and import it you have to set the scale appropriately.