Printing Custom GoPro Mounts for Cyclists

The GoPro mounting interface

GoPro uses a 2-prong/3-prong interlocking finger system. The camera has two mounting fingers at its base. The mount has three fingers. They interlock, and an M5 thumb screw passes through aligned holes to lock everything together.

The dimensions that matter for printing: prong width is approximately 3.0mm, gap between prongs is 3.1–3.5mm (variable at the tips), and the thumb screw hole is 5.0mm diameter. An Instructables GoPro mount project has caliper-verified measurements if you're designing from scratch.

For printing existing STLs, the critical tolerances are already built into the model. Print a test piece of just the finger interface before committing to a full mount. If the fit is too tight, add 0.1–0.15mm horizontal expansion in your slicer. If it's too loose, file or sand the prongs slightly. Most designers on Printables note that some test-fitting and adjustment is expected.

Mount types for cycling

Handlebar mount

Clamps around the handlebar tube. Standard road bar diameters are 31.8mm (oversized, most modern bikes) or 25.4mm (older or BMX bars). Some models are parametric so you can input your bar diameter. I run a handlebar mount on my road bike because it gives a forward-facing, low-vibration angle. Secured with two M4 bolts through the clamp halves.

Stem mount

Attaches to the steerer tube stem or around stem spacers. More centered view than a handlebar mount, lower profile. Good for time-lapse rides where you want a stable, non-oscillating perspective. Secured with M4 socket head cap screws or zip ties.

Garmin combo mount

This is the one I use most. It adds a GoPro interface underneath an existing Garmin out-front bike computer mount. If you already run a Garmin, this means no extra bar space used. The camera hangs below the computer, pointing forward. There are several versions on Printables designed for specific Garmin mount generations.

Saddle rail mount

Attaches to the twin rails under the saddle with zip ties. Points the camera backward for rear-facing safety footage. I've used this on commutes in heavy traffic. The footage isn't pretty (saddle vibration is worse than handlebar vibration) but having rear documentation is worth it.

Why PETG, not PLA

PLA is the wrong material for a cycling mount. A Prusa forum thread on vibration endurance captures the problem well: PLA is brittle under cyclic loading. Road vibration is continuous, high-frequency fatigue stress. PLA develops micro-cracks along layer boundaries, and one day the mount snaps cleanly in half. I had this happen at 35 km/h. The GoPro survived (tether saved it). The mount didn't.

PETG is the practical default. It deforms before it fractures, giving you a visible warning (bent mount arm) instead of a sudden snap. It handles UV exposure better than PLA, tolerates summer sun on a parked bike, and costs the same per kilogram. FDM parts lose approximately 55% of their strength in the Z-axis compared to the XY plane. PETG's fracture paths tend to ignore layer lines, suggesting better interlayer bonding than PLA.

For maximum vibration damping, print the mount body in PETG and add TPU bushings or washers between the mount and the handlebar. TPU 95A works well for this. A 2mm TPU gasket between clamp and bar absorbs high-frequency vibration before it reaches the GoPro. This is the same approach FPV drone racers use with their TPU camera mounts, and those survive far more vibration than any bicycle produces.

Dealing with road vibration

Vibration is the enemy. It causes two problems: mount fatigue (the mount eventually breaks) and video quality (shaky footage). Design and printing choices address both.

For mount longevity: increase wall count to at least 4 perimeters, especially around bolt holes and the GoPro finger interface. Use 40–60% infill. Add fillets at every internal corner where stress concentrates. Sharp corners are crack initiation points.

For video quality: the GoPro's internal stabilization (HyperSmooth) handles most vibration, but a rigid mount transmits sharp impacts directly to the camera. A thin TPU layer between mount and bar acts as a mechanical filter for high-frequency buzz while letting the camera follow the bike's larger movements naturally.

I've tried printing entire mounts in TPU. They work for vibration absorption but flex too much. The camera droops under its own weight and the viewing angle drifts during a ride. The best setup is a rigid PETG body with TPU isolation at the contact points.

Print settings and orientation

Print orientation matters more for cycling mounts than for most projects. The mount needs to resist three forces: clamping pressure (squeezing the bar), vibration-induced fatigue, and occasional impact (parking the bike, bumping a wall).

• Orient the part so clamping force acts along layers (XY plane), not splitting them apart.
• The GoPro finger interface should have layers parallel to the thumb screw's shear direction.
• 4+ walls, 50% infill, 0.2mm layer height.
• PETG at 235–245°C, 80°C bed. Print on the Q2 with chamber heating for best layer adhesion.
• Use a brim on flat mounting surfaces to prevent warping during the print.

For maximum strength, print slowly (40–50 mm/s) at the upper end of PETG's temperature range. Higher temperatures and slower speeds improve interlayer bonding, which is where cycling mounts fail. The common filaments collection has PETG in various colors if you want the mount to match your bike.

Recommended STL files

These are the models I've either printed myself or seen recommended consistently in cycling and 3D printing communities:

• GoPro Bike Mount by Toms (Printables) — clean handlebar clamp design, easy print.
• GoPro Mount for Garmin Out-Front (Printables) — adds GoPro interface below existing Garmin mount.
• GoPro Saddle Mount (Printables) — rail-mounted, zip-tie secured, rear-facing.
• Customizable GoPro Handlebar Mount (Thingiverse) — parametric, adjustable diameter and arm length.

If you're designing from scratch in Fusion 360 or OpenSCAD, the j-h-a/go-pro-mounts repo on GitHub has parametric OpenSCAD models with documented interface dimensions. Useful as a reference even if you prefer a different CAD tool.

Always use a tether

A printed mount can break. Expect it, plan for it. A GoPro HERO12 weighs 154g. At 40 km/h on pavement, that's a projectile you don't want bouncing into traffic or under someone's wheel.

Run a safety tether from the GoPro's thumb screw mounting point to your bike frame or handlebar. Commercial GoPro tethers are short coated steel wire lanyards rated to about 13 kg. A few dollars for a 5-pack. Cheap insurance against losing a $300+ camera. For similar tethering principles on flexible gear, the TPU phone case guide covers drop protection design. And for more outdoor mount projects, the camping gear article applies the same material durability logic to other outdoor prints. The TPU cosplay armor guide covers flexible material printing in more depth if you want to experiment with all-TPU mount designs.