Pop-up credit card wallet spreader with coin/cash storage - 3 card thinner version

This is a slight remix of the remix done by Mike_111723; original modular card wallet by CHKING.

What I changed:

• Edited the Middle Section to be 3mm thinner, now only measures 3mm vs 6mm.
• Added key ring to the Middle Section. 
• Edited the Card Pusher to only have 3 sections for pushing cards, now is also 3mm thinner. 
• Edited the Type A and Type B lever pegs to be slightly shorter to fit into the new shorter Card Pusher. 
• This wallet version is only for 3 cards.
• You will need 4 M3 x 8mm bolts and nuts.

Original remix text and instructions from Mike_111723:

Small magnets can be placed in the back door if needed but not essential as the latch is tight and it wouldn't be able to open on its own (Depending on your printer tolerance/tuning)

(Magnets 4x2mm)

I've also made a “Spacer” which takes the space of 5 cards, so if you wanted to go out and didn't want to carry all your cards, you can use the spacer plus 1 card only.

There are two lever versions, one has an added insert which will give the slider better grip if you prefer this option.

Print at layer height 0.2 with 3 walls, 4 top and 4 bottom layers and 15 - 20% grid infill. 

I recommend printing the Middle section, Card pusher and Lever in PETG for its flexural strength . The top and bottom sections will be fine using any type of filament.

*EDIT 07Feb24: Added a door with tighter closure