On Chrome only dials of radii smaller than 72 mm will print correctly.
Preview:
 
Dial Builder - a JavaScript and SVG utility to create circular dials and scales, with or without a vernier.

Copyright (C) 2014 Herr_Alien <alexandru.garofide@gmail.com>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/agpl.html>.