Other Issues:Beautiful design
I printed it 2 times with petg (basic) the first time a few small diamonds were not printed correctly at the back, or a few bars broke out. This was no longer the case with the second print, but you can still see that the design is not ideal. The joints are not the same thickness everywhere, which is why the parts have broken out.
I noticed the calculation is not that accurate than I thought, so that the joints at the back(one column) are thinner that other. those bars may be hard to print for some filaments or printers. try to fix it later.