This was pretty quick print and an easy MOD. have seen a difference in print quality due the the mechanicals of the belt tension. I always use, " BEN the floating BENCHMARK (Benchy) ": Thing (2795629) to test out printers, filaments and slicer profiles.
The Red cases were printed on the Ender 3. The Black tensioner parts were printed on a PRUSA MK3, due to the 270c temp for the filament.
Matter Hackers and 3DXTECH PTEG and Tactical Low-Gloss PETG
M.Hackers Red & 3DXTech Low Gloss Tac. Black
Check out the 3DXTECH - 3DXPro™ Low-gloss PETG. I am not affiliated, but really like the matte colors and strength.