Filament stopper for spool-less refill

I was looking for a reusable, waste-free system to store filament refills without a spool

My method until now was to use zip ties every time to secure the filament in the refill

Believing this procedure could be improved and was not very sustainable, I thought of designing a sliding and interlocking system to store spool-less filament refills, securing the filament, and thus preventing the filament from unraveling from the spools themselves

After various attempts and prototypes, I achieved this result which I consider satisfactory, as it meets my needs

The model consists of 3 parts: 1 internal part to be inserted first inside the filament refill, and 2 external parts to slide into the appropriate sliding guides, one at a time, adjusting them until they interlock and secure the filament in the spool

Thinking this might be a common problem, and having found nothing similar around, I decided to share and make this new tool available to others; it seeks to solve or at least mitigate the problem of not having a spool for every color

Download, try it, and give me feedback and suggestions in the comments if you like it, and if you want to support me, thank you very much

Note: I recommend printing on two separate build plates (as prepared); for greater precision and to avoid detachment from the build plate, I have added supports on the print bed

I made a new, additional version, suggested by a comment, with thicker outer parts

Personally, I prefer the first version, despite the thinner outer parts, as they are more flexible

Tell me your thoughts in the comments, download, print, and let me know in the comments if you like it and if you want to support me with a boost, thank you very much