Polarstar F2 engine installation kit for V2/V3

A perfect set of two shim shells which will keep your Polarstar F2 engine in place.

Common problem with F2 installation

1. engine wobbles side to side - unpredictable (bad) alignment
2. engine moves forward and backward - bad for airseal between the nozzle and hop up bucking

This kit solves both issues.

1. Increased diameter ensures no wobble, as the F2 engine gets clamped in tightly (but not too much)
2. Rear part pushes the engine as forward as possible without moving back. This ensures the nozzle is in contact with the hop up bucking, ensuring proper and stable air seal.

More details:

The shell should fit most if not all gearboxes. Some gearboxes (especially stock basic ones) are a bit narrower than others (cnc billet RA for example). The size has been made for maximum width possible so it is a really snug fit to prevent any movement in any gearbox. A very little force when screwing the gearbox together is acceptable (print PETG! as it's softer).

Tested gearboxes

• RetroArms 417
• RetroArms V2
• Double Eagle V2
• Specna Arms Orion
• E&L V3 gearbox
• E&C V2 gearbox

Print info

0.2mm nozzle !! Due to small diameter, 0.4 nozzle might print too large shell or too small

0.1mm layer

PETG highly recommended (softer)

4 walls

5 bottom, 5 top layers

How to install

There are arrows on both front and rear shell. Both arrows should be pointing in the direction forward (nozzle direction).

The rear shell is a very tight fit to ensure pushing the engine as forward as possible. When placing the engine, place the rear side first and and snap in the front part of the engine to the original cylinder head pin.

I haven't tested in all gearboxes, but if the rear shell is too big - you can sand it down a bit.