A removable spool that uses the same twist lock mechanism as a standard BBL spool. Should be compatible with most velcro straps, zip ties or twist ties but I designed it for this kind of strap ([https://www.amazon.com/dp/B07MWFRWKZ?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1](https://www.amazon.com/dp/B07MWFRWKZ?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1)), but they turned out to be a little too long. A ten inch strap would probably work a bit better. If you're like me and don't want to buy spools, or buy filament just to print more spools with, this spool lets you remove the refill filament in a controlled manner and store it so that you can install a new refill/stored refill. Just the filament also takes up less space, maximizing the effectiveness of your climate controlled filament storage areas. The goal was to add functionality to a stock type spool without slowing down the print time or increasing the complexity/material used.

In order to use:

For new refills, just put together like you would a normal BBL spool, but make sure the match marks (triangles on the inside of spool lip) are across from each other when fully latched.

To remove, use straps and tighten around the filament and cardboard using the slots. Make sure the thinnest part of the strap is on the half I have labelled the ‘Right’ (this side has cutouts to allow it to move by). Once all three are in place, remove the retaining clip and unscrew the two halves, the bound filament should come right out if done correctly.

To reinstall, follow the removal steps above in reverse, but make sure the ends of the straps aren't tucked into the center of the roll as it makes them hard to reach when unstrapping. Start with the match mark triangles lined up, back off until the two halves slip together, then tighten until the match marks are across from each other.

I printed it in PETG for more heat resistance and the uploaded profile is optimized for speed, it will probably string a little bit but nothing that can't be cleaned up in a minute or two with an exacto knife. Should print in PLA no problem, I don't have any abs/asa so I will have to rely on you all to let me know how that works.

About 3hr 20 minute to print and 145g of material for one spool.

Inspired originally by [https://makerworld.com/en/models/831795?from=search#profileId-776360](https://makerworld.com/en/models/831795?from=search#profileId-776360), I wasn't a fan of having to print two extra parts to hold it together, so I designed one from the ground up that coopts the bambulab spool latch, is compatible with the same retaining clips, and has slanted filament storage holes for ease of use.

Please let me know if you have any issues, I've printed and used these a little but I need more field tests (especially in the bottom half of filament rolls) to make sure the filament won't snag around any of the new geometry I have added.

Changelog:

V2.1- Thickened Right half to account for reduced thickness of cutouts, increased slant of filament end storage for ease of use.