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Hi Don, Michael, Rifleman and RomanModels,
Thanks a lot for comment and encouragement.
Answer to Michael's question. I got the basic Glowforge (used) early this year and it allowed me to resume paper modeling.
Working on engine.
There were few iterations to improve the final result. Let's see.
The original plan is simplified version of the real engine. Based on the build reports of many awesome modelers, some design modification/improvements were made.
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