BB shooting target 140mm

Well I bought the wrong cards, and loads of them. Turned out I needed 170mm for my steel target. So I made my own 140mm box. Indestructible by 6mm plastic BB's. I've been using it with 4,5mm steel BB's (at 3 joules) and it shows, although the damage is mainly cosmetical and not structural. I hotglued some foam inside to prevent ricochets but most of the bb's just go straight through the foam and collect nicely at the bottom opening Print and use at your own risk. Do not shoot at it with anything stronger than an airsoft pistol and wear safety glasses when shooting. I've had ricochets flying past my ears (before putting in the foam). The plastic has a surprisingly stronger “rebound” than the sheet steel in standard targets) This is a model designed quickly and sloppily (is that a word?), so there obviously is room for improvement. Feel free to remix. For other card sizes, just resize in your slicer. The fit for 140mm cards is maybe 1-2% too tight, keep that in mind when resizing.   Printed with: • eSun PLA+ (440grams used, a thicc boy as is necessary in my opinion) • 85% infill and 4 walls (0,6mm nozzle) • No support (but that wasn't such a good idea with some extreme overhangs, hence the line down the middle when the 2 large parts met) • Printed in upright orientation But I suppose any filament should do just fine. I chose PLA for the ease of printing. If I wanted to challenge myself, I'd make this in ABS but I really didn't feel like waisting half a kg of material several times just to get everything dialed in right. (I don't have the luxury of being able to babysit my printer) And I think hard TPU would be A LOT stronger but if PLA does the job, why make it harder and costlier.