Since the cardboard spools from Jayo are unfortunately not meant to go into the AMS, and so far, no ring adapter or other spool model has fit well or operated smoothly, so I created this one as part of the CBAS series.

The spool needs around 152 grams of filament with 15% infill, making it not lightweight but rather sturdy and smooth-running. So far it has always fit perfectly into the spools core. The Silica Compartment Lids add approximately another ~15 grams.

The adapter spool also fits the 650g JAYO spools (at least on the ones I could test). If it's different for you, let me know in the comments.

Updates

23/01/02 Silica compartment lid update

Added the Silica Compartment Lid (SCL) - with this cover, the spools core can be sealed, allowing it to be filled with silica bags or loose beads. Loose beads should be bigger than 1.5mm, as smaller beads may pass through the air slots. For easier tightening and loosening of the SCL, you can find the TwistAssist listed under accessories below. The SCL is only compatible with prints printed from files tagged with the SCL label.

Changed the default print profile to the SCL version. The SCL variant remains compatible with older versions. It gains approximately ~2 grams in weight.

23/12/25 Label space module update

The standard print profile has been changed to the label space module version. As a result, the spool becomes approximately 10 grams heavier but remains fully compatible with the original version.

Profiles for the label space modules have been added, labeled with the most common filaments as well as an unlabeled variant - unlabeled also available as .step file.

The 'JAYO 1.1' profile has been removed.

Assembly

To assemble, first remove a cardboard side of the JAYO spool and replace it with a printed half, some of the glue residue may need to be removed. Hold the spool and turn it over, then remove the other side, now screw the halves together until they are tight.

The LSM can be inserted into both parts of the spool, preferably when the spool is not yet loaded, and it may require some effort depending on your printer.

The SCL can be easily screwed into the thread of one of the spool cores.

It's best to wrap the filament with painter's tape beforehand to prevent it from unwinding on its own.

Accessories

This spool is part of the CBAS series and can make use of these accessories.

TwistAssist for spools of the CBAS series equipped with the Silica Compartment Lid (SCL):

TwistAssist for SCL

For those who prefer not to use the holes in the spool to secure the filament, here is the appropriate filament clip:

FilaClip for CBAS