Pastamatic Guide Rod with Replaceable Threaded Length

I printed the complete Pastamatic assembly, but found the guide rod incompatible with my filament spool; the filament wound unevenly. Designing a guide rod for each spool type proved impractical, so I devised this solution: the original rod is now modular, comprised of three parts secured by slots and screws. Adapting to different spools simply requires reprinting the central threaded rod.

Adjust the length in Bambu Studio, deselecting proportional scaling and adjusting only the Z-axis length. This value equals the spool's inner width minus the guide tube width (adding 1-2 millimeters is advisable).

For example: if the inner width is 50mm and the guide tube is 5mm wide, the Z-axis stretch length would be approximately 50 - 5 + 1 = 46mm. While not perfectly precise, my tests yielded relatively even winding.

Requires two M3x18 nuts; the 18mm length isn't mandatory—experiment with other sizes as needed (I only had 18mm available).

Supports are unnecessary. The file size is rather large, I apologize for the inconvenience; I'm not sure how to reduce it.