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mechanical magic you can print.

BY RUVEN BALS, INVENTOR OF THE GEAR BALL & SLIME BALL

Print-ready files for mechanical fidgets, puzzles and lamps.
Most print without supports, and every file is backed by my print guarantee.

Get your free model Join from $10/month
100M+
video views
130,000+
downloads
15,000+
followers
Get your free model Join from $10/month
100M+
video views
130,000+
downloads
15,000+
followers
FEATURED

My latest and favourite designs.

Squared Circle 
PRINT IN PLACE
NO SUPPORTS
Stretch Ball
PRINT IN PLACE
NO SUPPORTS
Slime Egg
PRINT IN PLACE
NO SUPPORTS
Slime Ball
PRINT IN PLACE
Orbifact
NO SUPPORTS
Planetary Gear Cube
NO SUPPORTS
Gear Ball
NO SUPPORTS
Slime Ball 2.0
PRINT IN PLACE
NO SUPPORTS
Slime Egg Print in Place
PRINT IN PLACE
NO SUPPORTS
Gear Ball 2.0
NO SUPPORTS
Gear Orb
NO SUPPORTS

See all designs →

FREE DOWNLOAD

Print the Gear Cube for free.

My most downloaded design. Enter your email and get the files for free. I will also let you know when a new design is out.

No spam. Unsubscribe with one click.
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HOW IT’S MADE

Engineered to move.

This is the Gear Ball, drawn live from its real geometry. Watch it come together: 8 gears seat on one core, one by one, then turn together.

✓
Improved for years. I have kept refining the Gear Ball since I first made it.
✓
Still getting better. I keep updating my designs so they print and move better.
✓
No supports. Print it with a standard profile, then put it together.
See the Gear Ball →
WHAT YOU GET

More files than you pay for, and help until they work.

New designs every month 4 on Basic, 15 on Inner Circle, unlimited on Commercial
$20–$75 of files a month
Welcome pack 1 free model the day you join
$5 value
Troubleshooting files Tighter and looser spare parts, so every print fits your printer
included
Assembly guides Step-by-step PDFs and videos where a design needs putting together
included
The print guarantee If a design won't print or work for you, I'll help you fix it, or you get that month back.
no risk
Inner Circle: about $75 of designs every month for $20.

Founding price: join now and keep today's price for as long as you stay, even if prices go up later.

Pick your plan.

Billed yearly. Immediate access, cancel anytime.

BASIC
$10 /month
$120 billed yearly
✓ 4 designs every month (about $20 of files)
✓ Welcome pack: 1 free model
✓ Troubleshooting files and assembly guides
✓ Print guarantee
Join Basic
INNER CIRCLE
$20 /month
$240 billed yearly
✓ 15 designs every month (about $75 of files)
✓ Welcome pack: 1 free model
✓ Troubleshooting files and assembly guides
✓ Print guarantee
Join Inner Circle
COMMERCIAL
$50 /month
$600 billed yearly
✓ Unlimited downloads
✓ Sell prints made from my files while your plan is active
✓ Troubleshooting files and assembly guides
✓ Print guarantee
Join Commercial
Print guarantee: if a design won't print or work for you, I'll help you fix it, or you get that month back.
Founding price: join now and keep today's price for as long as you stay.
FAQ

Before you join.

What if a design doesn't work for me?

Every membership comes with the print guarantee: if a design won't print or work for you, I'll help you fix it, or you get that month back. Most designs also include troubleshooting files with tighter and looser parts.

Which printer do I need?

STL files for every design you pick, and 3MF files where I have them.

Can I sell the prints?

Yes, with the Commercial plan. You can sell prints of my designs as long as your Commercial plan is active.

New designs every month. Start printing today.

Follow @Ruven_Bals for new designs and videos