Spine Rounding Tool (3d-printed, four-sided, 5x5 cm)

Spine Rounding Tool (3d-printed, four-sided, 5x5 cm)



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plastic, PLA


This is an analog of the wooden rounding tool you can find in our shop: https://www.etsy.com/shop/BonefolderClub?ref=l2-shopheader-name&search_query=Rundeholz

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: 5 cm;
- Height: 5 cm;
- Length: 21 cm / 31 cm / 39 cm;
- Groove diameters: four grooves on four sides of any diameter from 10 mm to 40 mm, that will fit in the design (please leave a comment upon ordering);
- The default set of grooves for this tool is: 15 mm, 20 mm, 30 mm, and 40 mm.

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).

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.

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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Jul 28 - Aug 24

Ready to ship in

1–2 weeks


The Netherlands

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Returns and exchanges accepted
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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.

233 shop reviews 5 out of 5 stars


scrobbesbyrigcyr Sep 2, 2018

5 out of 5 stars
Stepan is a really helpful seller, great communications. This spine rounding tool does the job well and is an impressive piece of 3D printing. Reasonable prices and quick international shipping.

Purchased item:

Jude Kingshott Jun 26, 2020

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

Purchased item:

Rachel Jun 15, 2020

4 out of 5 stars
The package arrived very torn up — it was international and I am sure that’s why (long travel time). Luckily everything was inside

Purchased item:

Amanda Fung May 11, 2020

5 out of 5 stars
Yayyy finally got my tool!! The pandemic caused some crazy delays in the wait time but it can’t be helped. I’m just glad it didn’t get lost in the mail! I was so excited when it finally came. I requested this tool in blue and it’s so pretty! It’s a really genius tool and will be so helpful when I go to bind books. Also really love the magnetic snap connector. Thank you so much!! Can’t wait to use it! 🙏🏻🙏🏻🙏🏻❤️

Purchased item: