While frustrating for my development cycle, I have never viewed this as a huge problem. There is a queue of items to be checked and then printed. If the checking is done as part of the batch assembly process, then it makes sense that models would sit in queue until ready to be printed.
I can support the desire to have models checked as soon as possible, but I can also imagine that Shapeways will have to change several things in their workflow to accommodate the extra status tracking required to check a model before it is placed in the queue waiting for a printer. There's also the general issue of the condition where checking is done as an integral part of the batch assembly process. Splitting that into two separate actions may require more labor, therefore extra expense.
There again.. I don't see this by itself as a problem.. as long they meet the Expected Ship Date, then the sequence of what gets processed when is irrelevant. Agreed, it's a bit of an issue IF a model is rejected. With PIA and the "second opinion" that they've talked about recently.. they are making progress on this subject.
Actually, taking extra days could be a good thing.. that (could) mean your item wasn't rejected offhand, and is being reviewed by a second pair of eyes.
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Years ago, I got in a bit of trouble for telling a boss "A watched pot never boils". We were watching online orders come in real time, and I was trying to express that the sales were going slow. He thought I was saying "get out of my computer room" and stormed out... oops.