Ultra slim credit card wallet

Use case

This credit card protector is so slim (3mm) that it can even be taken inside your leather wallet. In my take, any thinner is practically not possible. Even now, the print-in-place hinges are so delicate, that a low layer height of 0.15mm is advisable. 

Despite it's tiny dimension, it has a snap-in locking mechanism and does not need any assembly after printing. 

Printing

I recommend to print this part in the uploaded orientation with a layer height of 0.15mm or less. A standard 0.4mm nozzle will do. I have chosen 3 perimeters, but the default of 2 perimeters should be fine as well. There is almost no area of infill in this tiny design. I have chosen 50% infill, but it does likely not make much difference. 

I have successfully tried both PETG and PLA as material for this part. As the snap-lock is not under a lot of mechanical tension, the “flowing” effect of PLA should not be too much of a problem. 

Two version, loose and tight fitting

Due to the delicate design of the print-in-place hinges, I found it difficult to come up with a design that works well on all printers. A single design was either too loose on one printer or too tight (and fused together) on another one. For me the tight design was fine on a Prusa MK3.5 in PETG and on a Prusa Mini+ in PLA. The loose design was best for printing from PETG on a Prusa Mini. 

Please like it if you like it

Your satisfaction is my reward. If you like this design, please leave a like. Or even better, if you print it, please post a make and tell all of us how it worked for you.

Happy printing a happy and successfully new year 2025!