I broke another ECU cover retainer clip while testing an ECU for a customer — another JCW VIN change and immobilizer delete. Same story every time: pull the cover, hear the snap, clip’s gone.
I sell plug-and-play unlocked R53 ECUs with VIN changed and S, JCW, or GP1 software on Facebook Marketplace and NAM. The STL is on Cults3D if you want to print your own.
2001–2007 R53 Minis and R52 Cooper S models share a plastic ECU cover over the fuse box in the engine bay. The OEM clips are brittle — they snap off when you remove the cover for the first time, or the next time, or the time after that. Once the clips are gone the cover rattles and the wiring underneath is exposed.
Scanning the OEM cover
First time using my Pop 4 scanner, and first time in blue laser mode.
First scan with the Pop 4 — blue laser mode. Not a closed mesh, but enough to trace the cover.
Didn’t get a fully solid mesh — holes along the bottom edge and incomplete clip geometry — but it was good enough to sketch the replacement around in Fusion 360.
Imported mesh in Fusion — r53_ecu_cover and r53_ecu_cover_Edited bodies, solid ecu-cover sketched on top.
Printed in ASA and put the STL on Cults3D.
The part
One piece — ecu-cover.stl — with integrated snap clips on the sides and a clip on the bottom edge that hooks the fuse box housing. Same overall shape as the factory cover so it drops in without modifying the car.
Clip geometry on the long edge — modeled to match the OEM latch points.
Top surface and bottom-edge clip — same footprint as the factory cover.
Installed
Snaps into the existing fuse box and ECU harness routing. No zip ties, no tape, no hoping the old broken clips still sort of work.
Replacement cover clipped in — red intake plumbing and fuse box unchanged.
Bottom-edge clip engaged on the fuse box lip.
How to print it
Print standing up so the clip layers run the full length of each tab — much stronger than printing flat where the clips are built from short layer bonds. ASA works and handles under-hood heat; nylon would be better for clip flex and long-term fatigue if you have it.
| Setting | Notes |
|---|---|
| Material | ASA (what I used) or nylon (preferred for the clips) |
| Orientation | Vertical — clips along Z, not across layer lines |
| Size | 62 × 54 × 218 mm — check your bed before you slice |
Download the STL
| Item | Details |
|---|---|
| File | ecu-cover.stl |
| Fits | 2001–2007 R53 Mini, R52 Cooper S |
| Price | $5 on Cults3D |
Download: R53 mini ECU cover on Cults3D — $5.