I designed this in blender to wall mount a sword I printed. I use command strips to hang it and it has been on my wall with no issues for at least 3 years. One model is angular to hold the blade and the other is rounded to hold the handle.

I printed mine in petg but pla will work fine. I recommend you use at least 3 walls and 10% infill but to increase those numbers if your blade is heavier. While mine doesn't have holes to drill into a wall you can easily cut a hole into the model and mount it that way or just drill straight through it.