In order to use GRATKIT cardboard spools in the AMS, the CBAS series has been expanded.

The spool needs around 160 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 ~16 grams.

Updates

Assembly

To assemble, first remove a cardboard side of the GRATKIT 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 Label Space Module (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 Silica Compartment Lid (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