This case is for the phone Samsung Galaxy J7 Prime, that is g610 models; do not confuse with the J7 2016, j710 models.
Some of the models are designed for rigid materials and others for flexible ones. The models materials are not interchangeable, so pay attention to the file names. If you have any request on the design just ask me.
Update: Since this was the first phone case I designed, it has some flaws I learned over the years. Every model updated after November 3rd 2021 is based on the new design, more accurate and, to me, easier to modify.
The model for holding a pen was suggested by PoetsEspresso.
This is part of an update for the 2020 Valentine's Day, in which I add for most of my phone cases a "heart" version; a model with a hole in the back side with the shape of a heart.
Por el día de la independencia argentina, el 9 de Julio, voy a actualizar algunas de las carcasas para celulares con una versión que haga alusión a la bandera argentina. Por la finura de algunas partes, este diseño sólo es posible en celulares relativamente grandes.
2021 is the year when most of country started the covid-19 vaccination; that's why I added a design with the 2021 with the "0" as a virus silhouette and the "1" as a syringe.
For other phone cases check this.
Here is the explanation of the files names:

Flex: made for elastic filaments like TPU. Not tested for the models updated after Nov 3rd 2021, the rest tested on TPU.
Rigid: made for rigid (non-elastic) filaments like PLA, ABS, HIPS, etc. The entire model is a little bigger and the holes for the buttons are opened on the front side. Tested on PLA and PETG for the models updated after Nov 3rd 2021, the rest only on PLA.
Aired: It is widely opened in the back so that the phone can dissipate the heat easily.
Rugged: Reinforced version with grip marks on its sides.
Banded: It has regular horizontal grooves in the bed surface, to make the finished texture more regular, avoiding irregularities on that part, and with a better grip.
WG: suggested for white and gold models. It's better to print it in darker colours to make contrast.
B: suggested for black (dark gray) models. It's better to print it with light or transparent filaments.
Tato: I marked the phones I used, once, everyday.

I spend part of my time making these models, letting them available and free for everyone. If you want to support my work, you can contribute with me here:

Tag: pen holder