RatRig V-Core 3.1 400mm Removable Internal Spool Holder
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Allows you to remove the post that the spool sits on for easy spool changes when the bed is down low in the printer.
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Both pieces should print in the orientation they open up. I sized the tongue and groove slots to be a nice medium for both unfilled and filled filaments to allow easy enough removal of the spool mount post from the main body while also minimizing slop in the mechanism. STEP files are provided if you need to tweak the clearances for your use.
For the PTFE tubes, you may need to take a 4mm drill bit and slightly clear out the initial holes for get them to slide in nicely if your printer does not bridge nicely.
Given that this is meant to be mounted in the chamber I recommend it be printed out of at least ABS, if not an even higher temp material like annealed PET-CF or PPS-CF.
Also it is substantially easier if you get the spring loaded roll in M6 nuts instead of the traditional hammer nuts. The main body of this mod fits very tightly between the two upright extrusions, meaning if you have the M6 bolts and T nuts already installed to the main body it is near impossible to actually get in the place between the extrusions. With the roll in nuts, you install them into the extrusions before hand, then slide the printed main body in between the two upright extrusions, and then insert the bolts through the printed part and bolt it down. Way easier.