I really wanted a scroll for the O'Cello so I found this wonderful violin print designed by bchan based on a Stradivarius and scaled it up to use as a base model to design and build the scroll. https://pinshape.com/items/24608-3d-printed-violin Also, since there were no major changes, if you have already printed an O'cello, you can easily swap to this design as well.

First I had to make them mate up. I redesigned the top of the neck and the bottom of the scroll. I wanted a joint that had a mechanical fit and I also wanted to integrate the through holes for the strings.

This all took a fair bit of work to design, but the real challenge was to generate an FDM printable scroll. I tried a couple of orientations and supports systems, but everything came out ugly, until I had the idea for integrated support.

This is a challenging print, but with a little filing and sanding, the result is worth it.

I have included a "fit testing" file that just has the basic joint. You can use this to test your print settings or practice filing. Trust me, you should print this first, just to make sure!

Scroll further down the page for printing tips!

In hindsight, the design for the scroll join may be more complicated than it needs to be, but I am a former woodworker and like dovetails! The complicated support stand is an absolute must to get a decent print for a filament printer. After all the work, I was happy to get it working and am going to leave it as is.