Rounder and with cover - Trapezoid Blade Box Cutter Bed Scraper From Utility Knife

thingiverse

The original was a brilliant little tool, but those square edges were not great to hold. I remade this with slightly different dimensions to make it stronger, centred and easier to get the blade in and then I put huge fillets on it to make it feel lovely in your hand. I wanted mine as a general tool rather than to sit on the side of my 3D printer, so I made a nice simple cover that slots on and is held on by pressure. Make sure you print in the STL orientation with the flat rectangle on the bed and no supports are needed. You need m3 bolts and nuts to hold the blade in place as m4 bolts won't fit inside the blade cutouts. I used a hacksaw and file to cut down the bolts afterwards. I printed in PETG for strength and flex - YMMV with brittle/hard filaments! I used gluestick on my bed with PETG and as this is quite a tall print I'd advise you do the same or use a brim. See my make for lots of photos and better quality.