THE BRUSH BLOG
Stories, gear & friction.
Field notes, build logs, and everything we learn making climbing tools.
The hole the size of a fingernail that decides how quiet ChalkBlaster V2 is
ChalkBlaster V2 had four non-negotiables: maximum compactness, less noise than V1, intuitive to use, and the highest air velocity possible. The air intake is...
The hole the size of a fingernail that decides how quiet ChalkBlaster V2 is
ChalkBlaster V2 had four non-negotiables: maximum compactness, less noise than V1, intuitive to use, and th...
How a sales afternoon for an engineering firm turned into SWEEP Climbing
Paul discovered climbing two years ago and fell hard for it, from indoor bouldering to Fontainebleau. In Au...
We handed ChalkBlaster to pro climbers. Here's everything they hated.
We gave the first ChalkBlaster to pro climbers and asked them not to be polite. They weren't. Too loud, too...
Our first ChalkBlaster video hit 500K views. The comments were brutal.
The first ChalkBlaster video reached 500K views in a few weeks on a brand-new Instagram account with zero f...
Seven people told us they'd had the ChalkBlaster idea. Nobody had built it in 30 years.
The climbing brush hasn't changed in 30 years. Not because it's perfect, because good enough wins by defaul...
We wanted ChalkBlaster to be fully repairable. The prototypes broke more.
Early ChalkBlaster prototypes were built to be taken apart: no glue, every part replaceable, full disassemb...
The part that nearly killed ChalkBlaster wasn't the motor. It was the bristles.
We had the hard parts of ChalkBlaster figured out: a high-RPM motor, high-drain batteries, airflow that cou...
Why the ChalkBlaster brush head is printed at a 30-degree angle
Most 3D-printed parts are laid flat on the bed. We tilt the ChalkBlaster brush head by 30 degrees before pr...
The dumbest mistake we made with the first ChalkBlaster: we built four of it
The first ChalkBlaster launched in four versions: large and small, boar bristles and nylon. It felt like gi...
Shipping ChalkBlaster to 30 countries is not the dream it looks like
Opening the customer map and seeing ChalkBlasters in 30 countries, from Honolulu to Australia, feels incred...
The first three ChalkBlasters we ever built, and everything we've changed since
The first three ChalkBlaster units look almost identical to the one you can buy today. Inside, nearly every...
Two ways to make a brush insert. Only one survives production.
We tested two ways of making the ChalkBlaster brush insert. The artisan method presses boar bristles into a...
Our cleverest brush design lost to the simple one
ChalkBlaster brush V1 had a custom air channel splitting the bristles in half, so the jet blew straight ont...
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