Spine Rounding Tool (Large, Two-Sided, 4x20 cm / Rondzetblok / Rundeholz, 3D-Printed)

Spine Rounding Tool (Large, Two-Sided, 4x20 cm / Rondzetblok / Rundeholz, 3D-Printed)



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plastic, PLA


If you want to have your item(s) printed in multiple colors (layers), please add this item to your order: https://www.etsy.com/listing/782649648/add-more-colors-to-your-order

Each type of item and color combination demands an additional payment. See more information in the "Add More Colors to Your Order!" item description.Spine rounding tools are used to round spines of covers when one is making case bound books. Alternatively, they may be used to form a rounded spine of a book block.

In the first case, you place the spine of the cover in that groove and work it with something like a pestle until it is properly rounded. First, this allows making a perfectly round spine. Second, it protects from breaking or wrinkling the spine. You may start with a larger radius and steadily reach the needed radius with different groves to be even more careful.

While forming a book block, you have to put the sewn – but not yet glued book block – into the groove, gently form it and carefully take it out for gluing. I have never tried to do that – I’ve always rounded my books by hand and in a press. But I know bookbinders who use that method.

Tool sizes:
- Width: 20 cm;
- Height: 4 cm;
- Length: 21 cm / 30 cm / 39 cm;
- Groove diameters: up to seven grooves of any diameter from 10 mm to 50 mm on two sides of the tool, that will fit in the design (please leave a comment upon ordering).

You may also want to order a round sanding tool to accompany this rounding tool. They are used not only for sanding but also as a substitute of a pestle while rounding spines: https://www.etsy.com/shop/BonefolderClub?ref=l2-shopheader-name&search_query=Round+Sanding+Tool

Some of the benefits of the plastic tool compared to the wooden tool:
- The wood itself is much more expensive than plastic;
- Woodworking is a much more expensive process than 3d-printing;
- The weight of the wooden tool is higher. Hence, shipping is several-fold more expensive.
All that allows making plastic tool considerably cheaper.

By default, jigs are printed in any random color available at the moment. If you want to choose some specific color, please write us a message. Colors currently available are listed in our FAQ section: https://www.etsy.com/shop/BonefolderClub#more-section
If you want to get your jigs printed in some other color, that may be done for an additional 10 Euro fee (if the color is available at our supplier).

Estimated delivery

The estimated delivery date is based on your purchase date, the recipient's location (actual or inferred), the seller's processing time and location, and the shipping carrier. Other factors—like placing an order on a weekend or a holiday—may end up pushing the arrival of your item beyond the estimated delivery date. It's our hope that your item gets where it's going as soon as possible, but given the factors involved, this is only an estimate.

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Sep 8 - Oct 5

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Ready to ship in

3–4 weeks


The Netherlands

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Meet your seller

Stepan Chizhov

Stepan Chizhov

Owner of iBookBindingStore

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This seller usually responds within a few hours.

252 shop reviews 5 out of 5 stars


Jude Kingshott Jun 26, 2020

5 out of 5 stars
Great service. Fantastic customer care.

Purchased item:

Paul Miller Aug 5, 2020

5 out of 5 stars
Fantastic communications. I recommend this seller. But with confidence.

Purchased item:

detephoto Aug 2, 2020

5 out of 5 stars
This tool is amazing! Saves so much time in my bookbinding process. Thank you so much!

Purchased item:

melissahaviland Aug 1, 2020

5 out of 5 stars
These are beautiful. Mine were held up in US customs during Covid shutdown, but this was not the seller’s fault. They are large enough to make a versatile sheet of paper.

Purchased item:

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