| 摘要 |
A spool for a supply of printing material includes a first part having a shaft on which the supply of printing material is mountable, and a second part having an opening and being arranged to retain the supply of printing material mounted on the first part. The opening is arranged to engage the shaft. One or the other of the opening and the shaft is resilient and the other of the opening and the shaft has at least one part which extends towards the said one of said opening and the shaft more than at least one other part thereof to thereby cause the second part having the opening to engage with the shaft.
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