Sinclair Downloads

Here are useful downloads such as C5 3D printed spare parts.

All downloads are provided "as-is". I make no guarantees about the 3D printer files working on all printers. If you plan to share/modify these files it would be great if you could credit c5owners.com or link back to this page when sharing.

Selling C5Owners 3D Prints

If you intend to print and sell these STL files on places like eBay please include a credit to C5owners on your listing.

3D Printing Files

Boot Clip
Boot Clip

A simple replacement for the often-lost boot clip! Easy to print, no supports needed.

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Centre Cap
Centre Cap

Replacement rear-wheel centre caps. These are best printed vertically as shown in the picture with supports.

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Chain Tensioner Clip
Chain Tensioner Clip

A straight replacement for the chain tensioner clip which is easily lost. Easy to print, no supports needed.

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Cooling Fan
Cooling Fan

Allows you to connect a cooling fan to the C5's motor to help keep it cool. Is printed in 2 parts, the main unit and separate legs that connect to the motor.

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Frame Insert
Frame Insert

A simple replacement for the plastic frame inserts. Needs to be printed with supports enabled.

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Hi-Viz Mast Cap
Hi-Viz Mast Cap

This is a replacement for the rubber hi-viz mast cap. Can be printed without supports.

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Keyswitch Adapter
Keyswitch Adapter

This allows the original keyswitch adapter to be connected to a modern battery. For more information see this article.

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Mirror Bracket
Mirror Bracket

This is an attempt to recreate the mirror brackets, they can be printed without any supports.

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Motor Sensor Cap
Motor Sensor Cap

This hasn't been tested but was modelled on an original cap so may be useful. Can be printed without supports when orientated like I have it in the picture.

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Side Panel Clips
Side Panel Clips

Another one I never got around to testing but I am including them here should anyone want to try and recreate a full side panel kit. This will need to be printed with supports enabled.

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Bottom Bracket Spanner
Bottom Bracket Spanner

A bottom bracket spanner kindly provided by Paul Topping. Suggested printing in PETG but anything will work. Prints without supports.

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Steering Grommet
Steering Grommet

A replacement for the rubber steeing grommet. This hasn't been tested and is provided as-is.

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Latest from C5owners.com

Lotus C5 prototype by John Dunne It's a common misconception that Lotus only involvement in the C5 develop was the Y frame chassis, however as detailed in the Lotus World Magazine March 1985 & also in both of Barrie Will books who was the Managing Director of Sinclair Vehicle, Lotus developed, designed & build the C5 prototypes.
Lotus C5 prototype by John Dunne
posted on: 24/05/2020
Simplified Relay Controls This article by John Wilson shows how to re-wire a C5 with the original 12V motor.
Simplified Relay Controls
posted on: 27/04/2016
Control Clerk Training Notes Here are some rare C5 training notes from Hoover desgned for call centre staff and engineers.
Control Clerk Training Notes
posted on: 22/03/2016
Offroad Prototypes by Brian McCool For years there had been rumors about the Off Road C5's. Has anybody seen one?
Offroad Prototypes by Brian McCool
posted on: 10/03/2016