Fuel Injector Cleaning Adapter

Simple tool which slips over the injector, and then you shove the straw from your injector cleaning solution on the other. This is designed to fit over a standard Bosch EV1 or EV6 type injector with ~14mm nominal O-ring size.

Use a hose clamp / jubilee clip on the injector end, leaving the O-ring in position. The end for the straw is tapered slightly to accommodate different sizes. You may want to lubricate the straw to get it securely inserted, and maybe use a piece of heat shrink over it to get an even better seal.

Made this with 75A TPE material which worked well. However I noticed that carb cleaner caused a chemical reaction where the inside became brittle after a few minutes, so this is a sacrificial tool and you may want to print several. You could use a rigid material and then possibly use epoxy to secure the straw if using a flexible filament isn't an option for you.

For TPU / TPE I would suggest 4-5 walls and 15-30% infill so that there is still some flex. May need to experiment depending on your filament and settings. A smaller nozzle size (0.5mm or lower) is best, due to the narrow chimney section for the straw.

Also make sure your Z-seam is well tuned, you don't want a bulge or gaps. The scarf joint seam option usually leaves gaps when I use it for TPU, so that may need tuning.

No supports needed.