Sinclair Downloads

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

All downloads are provided "as-is". I make no gurantees 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.

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