DIY bike mount - Samsung Galaxy S9 Accessories

Measure your phone's width and height (or look it up).
Assemble 1/4 inch hardwood sticks to match your phone's 2 dimensional size.
Buy a sheet of 1/8 inch polycarbonate scrap (Tap Plastics in US)
Cut the sheet into a fat cross shape.
Apply double-sided tape to the hardwood sticks and adhere it to the poly. Align the center of the cross towards the bottom of the phone.
Use a heat gun to soften the poly and pull it/push it around the sticks. Use as little heat and as much force as possible because bubbles form around 260C.
Cut the bottom and sides so that the poly curls slightly over the sticks.
Cut the top so that it's flush with the top of the sticks. This is the release latch.
Break the sticks out and remove remains of the tape.
Bend down the top piece of plastic and begin to slide your phone into the case.
Note where the phone touches the poly sides first. Grind/cut away the inside of those edges to make insertion easier.
Grind/sand the center of the poly top side so that it doesn't catch on the cameras when the phone is inserted.
Scrub the holder thoroughly under water with a brush to remove any grit.
Insert the phone and note any adjustments needed. Mark on the poly where the USB and speaker ports are.
Remove the phone and finish all grinding/cutting to improve the shape.
If needed, adjust sides with a heat gun to be looser or tighter
Cut a hole in the bottom poly side for the USB port.
Drill a small hole in the bottom poly side for the speaker port.
Use a special epoxy for plastic to bond the holder to a bicycle clamp.
Scrub the holder thoroughly under water with a brush to remove any grit.
Add thin adhesive felt along the back to reduce vibration.
That's it. Done in a day.

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wormeyman said:
Upload some pictures!
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Here's a test build:
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The side plastic grips are touching the front glass and I'm worried about dirt causing scratches there. I think I'll try again and take photos of the progress. One mistake I made on the first try was starting with too small a piece of plastic that was difficult to work with. It takes a lot of force to bend the plastic without heating it to the point where it bubbles, and I didn't have enough to grab hold of.
I used to make these by encasing my phone in plastic bags and soft copper sheet metal, wrapping it with fiberglass, vacuum sealing, then carefully cutting the phone out. It makes for a beautiful fit that weighs almost nothing. On the down side, fiberglass and epoxy are messy as hell and I was terrified of destroying my phone. Bending polycarbonate over sticks is a lot less stressful.