TLDR
Heat-treating our FDM 3D-printed ChalkBlaster parts in batches gives up to 20% stronger parts at near-zero extra cost — same shape, tougher everywhere it counts.
The ChalkBlaster is built to be compact. It’s also built to be abused. Thrown across a gym, dropped on a crash pad, stepped on mid-session, buried under shoes in a bag. Climbers are not careful with their gear — and we wouldn’t have it any other way.
That means we’re constantly trying to make it as durable as possible while keeping it small enough to stay out of the way. It has to handle peak impacts without cracking — in a package that fits anywhere.
The problem with 3D-printed parts
One of the less-talked-about steps in how we produce the ChalkBlaster is heat treatment for our FDM 3D-printed parts. FDM printing lays down material in layers, and the bonds between those layers are the weak point — that’s where parts fail under load.
When we were testing early ChalkBlaster components without heat treatment, parts were consistently breaking at 12–13 kg. For a device that gets thrown around, stepped on, and taken through session after session, that margin wasn’t good enough.
Without heat treatment
12–13
kg at fracture
With heat treatment
16–17
kg at fracture
+20%
stronger parts on average. The cost added per unit: close to nothing.
Heat treatment lets those inter-layer bonds strengthen without touching the geometry. The part comes out of the oven the same shape — just structurally tighter. No redesign required, no dimensional change. Just a better part.
Why batch processing makes it viable
The key word is batch. Running a single part through this process probably isn’t worth the setup. But when you’re producing ChalkBlasters at volume, you load the oven once and the energy cost gets divided across every unit in that run. The maths work out fast.
For us, it’s not about compensating for bad design — it’s about unlocking headroom. Those extra kilograms of load capacity mean we can keep the ChalkBlaster compact without sacrificing the durability it needs to survive real use. That’s the balance we’re always chasing.
From the community
We shared this on LinkedIn and the response was worth continuing here.
Robin Diekmann
Asked about design guidelines — whether parts need to be designed differently to benefit from heat treatment. Short answer: no major redesign needed, but wall thickness and infill density influence how much you gain. We’ll go deeper on this in a future post.
Yosif Pavlov
Runs a dedicated oven at his factory for plastic parts — exactly the setup that makes batch processing viable. Once it’s in your production line, it’s just another step.
Lucas Grodd
Had been curious about FDM heat treatment for a long time but hadn’t seen it put into real practice. That’s exactly why we posted it — this stuff happens quietly on production floors and rarely makes it online.
SWEEP Climbing builds tools for climbers who take friction seriously.
0 comments