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Picture Frame Band Clamp Corner Block
This corner block is for strap or band clamps when you glue up mitred picture frames and boxes. Print four. Each block has a pair of 90° jaws, 40 mm long and 21 mm tall, that hold the frame square. A rounded R12 outer face lets the strap wrap without kinking, and a 3 mm bottom lip keeps a strap of any width from sliding off. A 3 mm leveling ledge holds all four corners in one plane, and a 6 mm through-hole at the inside corner lets glue squeeze-out drip away so the joint doesn't glue itself to the block.
Screw-Tension Band Clamp 60-68 mm
A T-bolt style band clamp that draws down evenly on anything 60–68 mm OD (2" PVC at 60.3 mm, 63 mm PE pipe, 2.5" dust hose, pond and irrigation hose) using one M5 x 50 bolt and a captured M5 nut in a 5.7 mm across-flats hex pocket. The 14 mm wide, 2.8 mm thick band has a smooth 68 mm bore with no screw slots or sharp tail, so it spreads load without gouging silicone hose the way an oversized worm-drive clamp does; thickened 9 mm end bosses keep the clamping pressure even and the whole 81 x 74 x 14 mm part prints flat with the hoop load in the XY plane.