it is designed to be printed and subsequently interlocked, the walls are directional and the holes are symmetrical
two perimeters lines and 15% infilling are enough, the supports are used exclusively to print the pen holder (printed upside down), for greater resistance I recommend printing it in PETG
*** 20/02/2024 UPDATE ***
A new gadget to attack has been added, the letter holder
The author marked this model as their own original creation.