I bought a FlashForge Creator Pro 2017 for my business and was frustrated by the hard to reach and clumsy rear spool holders. After not finding a good alternative, I decided to design my own. These spool holders attach to the printer using some of the existing screws (4 on top, 1 on the side for each). They each require a 63 inch (1.6 meter) length of 6mm outer diameter, 4mm inner diameter PTFE tubing to rout the filament to the hot end. My source: https://www.amazon.com/gp/product/B01A42FZY4/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1.
I only have one spool holder installed currently, as I have optimized my machine for fast ABS printing. I've been been printing with this spool holder for many hours now, and it's been working perfectly. I hope this helps all the other makers out there looking to use their FFCP 2017 to pump out lots of parts! If you have any suggestions for improvements, please let me know.
I would recommend printing this with 6 shell layers for extra strength using ABS. PLA should also work.
I designed this in Solidworks and decided to provide .STEP files in case you want to modify the design. An improvement I'm thinking of is to include mounting features for a dust shield that can slide over the spool.
In order to get the dimensions and feature right, I created a precise model of the top and side features of the Flashforge Creator Pro 2017 enclosure.