3D print parts

I printed everything except the buttons with black PLA at 0.025 (!!!) mm layer height. The buttons were printed with black TPE.

Populate PCB

I started with the FPC connector since it's the most difficult one to work with and I don't have a hot air gun.

Insert LCD on connector

Screw LCD support piece to the board and back face piece

Use the M3x8 countersunk screws to do this. Place the LCD inside the support piece afterwards.

Insert M3x12 countersunk screws to subassembly

Do not fully screw in yet. Make sure it is flush.

Place inner body on top of the whole subassembly

Make sure the gap is near the buttons and not the battery.

Place front face and screw everything together

Tighten and make sure everything is as flush as it can be.

Place strap and M2x12 screws