Modular 19-Inch Rack Frame

This is a highly scalable, fully printable start kit for a 19-inch desktop server rack frame. The standard span required for a 19" rack is too large to print on a typical printer, so horizontal beams are constructed modularly using heavy-duty half-lap puzzle joints to ensure structural integrity across a 480mm width. Uprights are provided as modular "1U" blocks designed to perfectly stack, locking into horizontal base brackets.

What it's for

This framework creates an expandable desktop rack suited for network gear, homelab gear, and audio equipment. The modular upright blocks feature standard EIA-310 spacing and are formed with hollow cavities and 9.5mm square holes meant to natively seat standard M6 rack cage nuts.

Dimensions

• Horizontal clearance: Maintains exact standard internal 19-inch spacing (483mm outer edge, 450.85mm internal opening).
• Vertical Height per Block: 44.45 mm (exact 1U metric).
• Longest individual part: At 190mm, the side crossbeams fit diagonally on almost every standard FDM printer, including smaller 180x180mm beds like the Prusa Mini.

Required Hardware

Because pure plastic structures under tension will deform when housing heavy loads, this design harnesses standard metal rods and bolting for the structural backbone:

• Upright Backbone: 2x standard 8mm (M8) threaded rods. Thread these down the large circular columns visible behind the rack uprights to clamp your modular 'X' U heights firmly to the base corners.
• Crossbeam Lap Joints: 4x M4 Bolts and nuts (or equivalent standard machine screws) to bolt down the interlaced crossbeams.
• Corner Anchors: 2x M4 bolts to lock the outer beams securely into the corner mortises.