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Thank you for this design. It is excellent. I printed and assembled the 'scope but failed to print the large drive gear. For some reason my printer only prints the first 3-4 mm. I tried different settings, different PLA filament, leveling the build plate, but with the same (non) result. I am now printing a 'drive gear' of my own design. Has anyone else experienced this. I am using a Makerbot Replicator 2. Any suggestions to address this problem is welcome. Thank you.