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Desk-Side Steel Rule And Craft Knife Holster
A holster that screws to the side of a hobby desk with two #8 wood screws (4.5 mm holes). It has a 36 x 4 mm slot for a 300 mm steel rule up to 32 mm wide, two 13 mm wells for craft knife handles, an 18 x 14 mm scissors slot and a 30 mm deep pocket for blade packs and pencils. Each slot has a drain hole so shavings fall out. It measures 96 x 24 x 72 mm and prints upright, open side up, with no supports.
Flagged: a sharp edge or blade. Not for safety-critical use without independent engineering review.
Steel Rule Clamp-On Square Head
A clamp-on combination-square head that fits any flat steel rule 12–32 mm wide and up to 2 mm thick. It gives the rule a 90° reference face and a 45° mitre face, so a loose ruler works as a try square, mitre square or depth gauge. The head is 80 x 38 x 18 mm. An M5 bolt runs through a 5.5 mm clearance hole into a captured M5 hex nut (8 mm across flats, pocket allows up to 5 mm thick) and locks the rule against the slot's end wall. The 90° face prints on the bed, so it comes out flat.