Washer for Brompton T-Line Hinge Clamp

There's a small plastic washer inside the hinge clamp of the Brompton T-Line. It can get damaged if the hinge clamp is knocked against something when walking around with the bike folded. If your hinge wobbles around and makes it difficult to unfold the bike, then this print will save you buying a whole new hinge clamp.

You can avoid damaging the washer by tightening the hinge clamp after you fold the bike. (But that will then make it slower to unfold the bike!)

This model is a direct copy of the original part, and prints in about one minute.

Printing

Nozzle: 0.4mm (finer nozzles may be better suited, given the part is so small.)
Material: ASA (tested), ABS, PETG (tested)
Layer Height: 0.2mm
Perimeters: 3
Infill: Solid

Because the part is so small, I recommend printing 5-10 in one go, to avoid heat buildup in a single part.

Without ironing, the top surface can be quite rough – that doesn't negatively affect the part, but you can iron the top surfaces if it bugs you.

PETG works, but is softer than ASA/ABS, so I think it doesn't last as long. I'm now printing this part in ASA.

Fitting

First remove the damaged washer from the inside of the clamp. This is most easily done by flicking it out with a small screwdriver, using the small raised part of the washer for leverage.

Insert the replacement washer – it should clip in relatively easily. You may then need to push it up against the clamp until it clicks into position. The little tab on the top of the washer should face away from the clamp, towards the hinge – I think it's to make it easier to remove the washer with a screwdriver. Once the washer is clicked into place the clamp should no longer wiggle around so much.