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UPDATED Feb 2026: I've designed an alternative spool base with a friction-fit connector to the spool posts! There are two post versions, each with two tolerances. A tester base is included in the friction-fit spool profile for you to test which post will best fit your needs.

• Slot Post: Includes a cutout in the middle of the post to insert the end of your zipper tape, binding, webbing, etc. so you don't have to use tape to secure the starting end. 
• Solid Post: Just a post, no cutout in the middle

** Multiple post sizes are included, or you can adjust the Z value in Bambu Studio to make the post (just about) any size! Do not shrink the post below 31mm, as the two base ends are 15mm each. 

Tolerances:

• Tight Post (.01 offset): The offset on these posts is just enough to put the spool together, but you're probably going to break the base before you are able to pull them apart again….
• Less Tight Post (.05 offset): Loose enough that you can pull the post and base apart after assembly. Depending on your machine and filament, this tolerance might be “just right” or you might need to use a dab of glue to hold the spool together.

**I'm happy to make spools with other friction tolerances if desired. 

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I designed this to help organize my zipper collection and bag making supplies. It's sized to perfectly hold a 9 yd roll of #5 zipper tape from wawak.com, but you can use it to organize cords, ribbon, thin rope, wire, you name it! 

Check out the other base designs, too!

Starburst Bobbin	Pinwheel Bobbin

I put a lot of work into designing the threads so that the square ends aligned EVERY TIME so that you can lay it flat or store it on it's side. The two end pieces are identical, so no need to worry about printing side A vs. side B or anything like that.

There are also two post lengths included: 35 mm, which is enough to hold one role of zipper tape, or 70 mm, which is enough to hold two roles! If you want me to make a different post length give me a boost and send me a message, I'm happy to add more sizes.

Model is printed in Polymaker PolyLite PLA Pro in Magenta. We all need more hot pink in our lives :)