Print-on-demand custom journals are journals that are printed only when they are ordered, rather than being produced in bulk and stored in a warehouse. This allows for more efficient use of resources and eliminates the need for large upfront investments in inventory.

There are several companies that offer print-on-demand custom journal printing services. Some popular options include:

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1. Blurb: Blurb offers custom journal printing services with a range of customization options, including cover design, paper type, and binding.

2. Lulu: Lulu is a self-publishing platform that offers print-on-demand services for a variety of products, including journals. They offer several binding options, including perfect binding and spiral binding.

3. CreateSpace: CreateSpace is a subsidiary of Amazon that provides print-on-demand services for self-publishing authors, including custom journal printing.

4. IngramSpark: IngramSpark is a print-on-demand platform that offers custom journal printing services with a range of binding options, including perfect binding, saddle-stitch binding, and wire-o binding.

When using a print-on-demand custom journal printing service, it's important to ensure that the company offers high-quality printing, a range of customization options, and timely delivery. It may also be helpful to request a sample or proof of the journal before placing a large order.