UM2 Quick-swap Filament Mount

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There are four models attached here:1.  Spool MountThe spool mount attaches to the back of the Ultimaker 2 and enables quick swapping of various spindles. This can be useful if you have filament spools from different sources that all require different diameter spindles. The spool mount is the most challenging part to print, and should be printed using supports to ensure a successful outcome. I found that Cura's 'grid' style supports were too difficult to remove, but had success with the 'line' style of support structure. Be cautious when removing the supports, as it's quite easy to break the little mounting clips at the top of the part.The good news is, you only need one successful print of this part, and you're done.Update - I highly recommend printing the 'v6a' version of this part, which reinforces the main clip making it both easier to remove the supports and sturdier when installed on the printer.2.  49mm Filament SpindleThis part is designed to mount the official UM2 filament spools. Like the original filament mount, this part is long enough to mount two spools simultaneously.Supports are highly recommended when printing this part.3.  38mm Filament SpindleThis part can be used to mount spools that expect a 38mm spindle size, as used by some Australian retailers. It should print easily with minimal support requirements.4.  31mm Filament SpindleThis part is ideal for mounting spools that expect a 31mm spindle size, as used by some low-cost Hong Kong retailers. It should print effortlessly without any support needed.