Smartphone (iPhone12 Pro Max) cradle with cool magnetic "snap-in"

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Design

This smartphone cradle is available in several variations and can be customized for sizes other than the iPhone12 Pro Max. It is compatible with RAM® mounts.

It features a super-cool snap mechanism using Neodymium magnets.

Assembly video: https://youtu.be/3yurNUBMnwM

Print instructions

This print is provided in variations you can choose from depending on your configuration. To start with, there is a plain version and one including a multi color Harry's LapTimer logo (www.gps-laptimer.de ).

Print settings

In case the mount will be utilized in a car, PETG filament is recommended. PLA is working in terms of stability, but will show problems with temperatures and UV light.

Nozzle 0.4mm, layer height 0.2mm

Print options

In case you have a Prusa i3 MK3* and an iPhone12 Pro Max, things are easy. Choose one of the two .gcode files and print. The multi color version will ask you to change filament 7 times (start print with any color and change to black, gray, white, black, gray, black when prompted). This can be done manually and without a MMU.

In case you use a different printer but have an iPhone12 Pro Max, you can print the .stl files included. Both a plain and a black/gray/white multicolor version for the upper part of the base are included.

In case you want to use the cradle for a different smartphone type, you can use the . f3d (Fusion360) file. Smartphone dimensions are fully parametrized. Only in case you want to create a different sized version with logo, manual changes will be required.

Print the .stl files

When adding the .stl files to your slicer, make sure you flip the upper and lower base parts so the top is lying on the sheet (180 degree rotation around X or Y). All clips need to be flip to the side (90 degree rotation). The flipped lower part needs small support under the two holes. See my layout in Prusaslicer in one of the pictures above.

Assembling

With all parts printed, find the top clip and the right clip both with a hole for a magnet. It is a good idea to hone the clips a bit so they can travel freely in the upper an lower base parts later. The smoother the better.

Press a magnet into each of this clips. Now, add one magnet to the top and one to the bottom of the pressed in magnet. Magnets are directional. By preparing the assembly like this, they will be in the right direction. Now, place the clips with 3 magnets each into the upper and lower base parts. Both parts will take two magnets from the clip, firmly press them in. Now, add the three other clips without magnets. Press upper and lower parts together and attache the mount part with two screws. Do not tighten the screws too much so the two magnetic clips can travel freely. Once everything is fine, add a drop of oil to each.

RAM® mount compatibility

The lower base is compatible to the RAM® Composite Diamond Ball Base, Part#: RAP-B-238U. From here, you can choose further RAM components. A printable alternative for the ball base is available here: https://www.thingiverse.com/thing:2608244

Other stuff required

The holes in the lower base take screws with a M4x0.7 thread. I use black ones with a length of 18 millimeters.

For the super cool snap mechanism, 6 Neodymium magnets of size 8x3mm are required. You can find them on Amazon for small money.