HelioTrak Sundial Parts &
This is the page for ordering HelioTrak
3D-printed parts, accessories, and ready-to-use
sundials. Note: 3D-printed parts are currently out of stock.
I'm expecting more inventory in February 2021. If you plan to
order then, let me know so that I can plan for it.
This is a low-volume, low-profit business. I don't have a fancy
e-commerce web site. I'm just one person hand-building sundials
and filling orders myself to encourage science education. If you
want parts in larger quantities, you can save money by buying
These are homemade 3D-printed products. Expect minor defects
like bumpy surfaces. The sticker sheet is not scored
or perforated -- you must cut the shapes manually with scissors.
The compass could be off by a few degrees, but you can calibrate
it as described in the HelioTrak download
& assembly page
Item #1: Sundial accessory parts only
parts), $10. This kit includes the compass, bubble level, nylon
hex nut, and stick-on analemmas and hour numbers. Use this kit
if you 3D-print your own main parts. Currently in stock (January 2021).
Item #2: Set of 3D-printed parts and accessories
Everything you need to assemble a sundial except for epoxy glue.
Assembly instructions are on the HelioTrak download
& assembly page
. Part colors may differ somewhat from
those shown in the photo.
Item #3: Fully assembled sundial,
$45. Same as
Item #2 but ready to use, all glued and stickered, plus a sheet
of spare stickers. Part colors may differ somewhat from those
shown in the photo.
Item #4: Optional removable handle extender
allows tripod mounting with full swing of the solar tracking
cage. $5 if purchased with other items or $8 alone.
To order, go to PayPal.com and send the appropriate dollar
amount to Gray Chang at this email address:
Be sure to tell me in the "add a note" section:
- The items you want
- The quantity of each item
- The delivery address (U.S. only)
I'll acknowledge your payment and send out the items within 5
business days. The price includes delivery by mail and taxes
where applicable. Sorry, no foreign orders -- I don't know how
to do the mailing. If you have any questions, email me at the
If you haven't used PayPal before, you'll need to create an
account, which takes a few minutes. The payment comes from your
credit card or bank account.