Wanhao D6 Drive Block for Flex Filament with Adjustable Tension

This is a remix from quickturn's flexible filament drive block, with several enhancements. I narrowed the hole under the gear, and added a cone to fit into the stock metal mounting plate. I also moved the spring-holding hemisphere off to its own mesh and provided 3 different heights to allow you to adjust the gear idler tension. You may have to ream out the hole for the filament slightly, depending on your print material and settings.