Body caps · STL / 3MF
Canon RF body cap to 3D print
A body cap for Canon RF cameras that you print yourself. It clicks in like a lens, prints face down without supports, and can carry a label such as A-CAM, your logo or the mount code on the face, so you tell bodies apart at a glance.
Not print-tested on a Canon RF camera yet. Your files include a fit test ring: print it first (about 11 min), it shows on your camera whether the cap goes in, turns and clicks. Open the generator
Clicks in like a lens
The cap carries the lens side of the Canon RF bayonet: lip, neck and three lugs. Put the grooved mark at the camera's mount dot, insert and turn clockwise (seen from the front) until the camera's locking pin clicks into its hole. The lens release button takes it off again.
Measured, and no deeper than a lens
The bayonet is measured from two RF parts that fit real cameras, a printed RF camera adapter and a printed RF bayonet template. They agree on the lug position behind the mount face within 0.05 mm. The camera's springs press the lugs, so what decides the fit is how far the lugs sit behind the mount face (4.2 mm here). The fit test ring in your files checks that on your camera. Nothing reaches deeper into the camera than a lens's own bayonet: the back of the lugs ends 5.5 mm behind the mount face.
Made for FDM printing
Face down on the plate, no supports: the only overhangs are short ledges under the lugs. Vertical teeth or flutes hide layer lines, and the face gets the finish of your build plate.
Your label, logo or the mount code
Optional: a short label of up to 7 characters (A-CAM, FX6, B), your own logo or the mount code in big letters, as a flush inlay in a second colour or engraved 0.5 mm into the face for one filament (tip: one wall on the first layer keeps it crisp). The mount code can also sit small above a label or logo. Inside, the mount code and the Focus Rings logo are engraved in the floor.
Fits
- Canon EOS R mirrorless cameras, full frame and APS-C (RF-S bodies take RF caps too)
- Canon cinema cameras with an RF mount, such as the EOS C70, C80, C400 and R5 C
- RF-mount cameras from other makers and RF adapters with an RF bayonet at the front
| Mount | Canon RF |
|---|---|
| Outside diameter | Ø68.0 mm |
| Height | 13.1 mm |
| Depth in the camera | 5.5 mm behind the mount face |
| Holds by | Lens-side bayonet; clicks onto the camera's locking pin |
| Grip | Module 0.8 gear (83 teeth) or flutes |
| Print orientation | Face down, no supports |
| Print time (slicer estimate) | about 28 min, about 13 g PLA |
| Fit test ring | Included with paid files, about 11 min |
| Files | 3MF (body + face inlay as one object), aligned STLs, printing guide |
Print times are Bambu Studio estimates for an X1C with a 0.4 mm nozzle and 0.20 mm layers. Not every camera has been tested: print the fit test ring from your files first and try it on your camera.
Print and fit
- Check the fit first: your files include a fit test ring, the bayonet zone only, done in about 11 min. Print it before the cap.
- Put the grooved mark at the camera's mount dot, insert the cap or test ring and turn it clockwise (seen from the front) until it stops and clicks. It should turn with even resistance and sit without play.
- Print the cap face down on the build plate, no supports. Two-colour faces: keep body and inlay as one object and give each part a filament.
- Clean the inside before the first use: remove strings and crumbs, rinse, let it dry and blow it out. It faces the sensor.
Questions
Which cameras does the Canon RF body cap fit?
Canon EOS R mirrorless cameras, full frame and APS-C (RF-S bodies take RF caps too); Canon cinema cameras with an RF mount, such as the EOS C70, C80, C400 and R5 C; RF-mount cameras from other makers and RF adapters with an RF bayonet at the front.
Has this Canon RF body cap been tested on a camera?
Not yet. Its bayonet is measured from an RF camera adapter and an RF bayonet template that fit real cameras, and every file is checked layer by layer for printability, but we have not fitted this cap on a Canon RF camera ourselves yet. Print the fit test ring from your files first: it is done in about 11 min and shows on your camera whether the cap goes in, turns and clicks. Too tight or too loose? Tell us: the lug position is adjustable.
Is it safe for the camera's sensor?
It reaches no deeper into the camera than a lens's own bayonet: 5.5 mm behind the mount face. The inside faces the sensor, so remove every string and crumb, rinse the cap, let it dry and blow it out before the first use. Never use a cap with cracked lugs.
Does it need supports?
No. The cap prints face down on the build plate; the only overhangs are short ledges under the lugs, under 1 mm.
Which filament should I use?
Rings without clamps and lens caps: PLA or PETG, 0.4 mm nozzle, 0.20 mm layers, your usual walls. PETG is a little tougher if the cap lives in a bag.
Why gear teeth on a body cap?
They are the same module 0.8 teeth as our focus rings: they grip well with gloves and hide layer lines. Prefer something smoother? Pick the flutes grip.
What does it cost?
One price per cap file, blank or with a label, your logo, the mount code or the AirTag pocket, whichever you combine. Every file comes with a fit test ring for your camera.