This is the best way to deal with this bug from Rhino V5.
Since you can’t import something twice, use blocks for things that scale 1:1 in size and History for things that don’t. Then, line 'em up Henry Ford style. Use _Repeat X (slightly faster; 1 less Enter keypress per cmd). Select the 17 things you just made and organize them onto a layer. Then repeat the _Repeat and organize steps half a dozen times.
Finally, you can move them off the factory floor and into your model.*
Giant Asterisk - Be careful to stay away from these things or else you have to start over:
– Don’t be tempted to do something for all 17 blocks at once! Use _Repeat and do them one at a time. Commands like OffsetMultiple will crash Rhino (no youtrack).
– Never mix input geometry from inside the block with geometry that’s outside. Some commands are fine (Loft), but many are broken (Sweep1) (no youtrack).
– Make sure your block is how you want it because any edit (even an accidental dbl click with no edits) will break all of your history (no youtrack).
I’m sure there are more tips. It’s just hard to remember them all in one sitting. Ten years of tiptoeing around this block bug and that import bug…you forget that this silly habit is because of that silly bug. But I waste hours every day dealing with this. I will make another mistake and have to start over. And I will be back to share more with you guys.