Heads up: many models on this page are AI-generated or uploaded untested. They may be misconfigured for the intended application — check the dimensions and tolerances, and verify or edit the model before printing or relying on it.*
Mini-Split Line Set Wall Penetration Hood
This is an open-bottom wall hood for a DIY ductless mini-split install. It covers a 2-1/2 to 3 in (64–76 mm) line-set hole, and the top of a line-hide duct up to 100 mm wide and 38 mm deep slides up under its open end. The hood is 106 x 128 x 42 mm with 2.4 mm walls. It mounts with three #8 wood screws (4.8 mm bores) through posts you drive through from the front, so you don't need a brand-specific inlet cap from a bundle kit.
Furnace Filter Swing-Aside Spring Retainer Clip
A 16 mm wide flex-finger clip that screws next to a furnace or return-air filter slot with one #8 or M4 screw (4.5 mm hole). It holds filters up to 24 mm thick (standard 1" nominal) with a sprung pressure nub, and the lift lip at the tip lets you flick it aside without tools when you swap the filter. It replaces the lost or broken sheet-metal turn-buttons on filter doors. The finger flexes in the layer plane, so it won't split along layer lines. Overall size is 70 x 32 x 16 mm.
Bicone-Pivot Filter Grille Turn Clip
A two-piece print-in-place swivel clip that replaces a missing filter retainer on a return-air grille. You fasten it to the grille frame flange with one #6 or #8 wood screw, or an M4 bolt, through a 4.5 mm sleeve. Then you swing the 58 mm × 16 mm arm over the filter edge to hold it. The arm turns on a double-cone (bicone) bearing with a 0.5 mm gap and 45° faces, so it prints without supports and can't slide off the sleeve, even before it is screwed down.
Universal V-Jaw Duct Damper Lever
A 110 mm replacement handle for a round-duct balancing damper whose stamped lever has snapped off. The 28 mm hub has a 90° V-jaw that takes any 5–10 mm round or square damper shaft, clamped by an M4 set screw in a heat-set insert. A rib along the top lines up with the damper blade so you can see its setting, and a 4.5 mm tip hole lets a #8 sheet-metal screw lock the setting to the duct.
3/4 in PVC Condensate Drain Critter Guard
A slip-on slotted end cap for the outside end of a 3/4 in schedule 40 PVC AC condensate line (26.7 mm OD). Six crush ribs grip the pipe, and 2.4 mm drain slots let water and algae out while keeping wasps, mud daubers and lizards from nesting in the line and backing up the air handler. Measures 32 mm OD x 30 mm tall. The pipe stops on an internal ledge 3 mm above the grate, which leaves a small chamber so water can spread across all the slots.
Parametric 4x4 in Drop-In Register Grille
A drop-in wall or ceiling register grille for a 4 x 4 in (101.6 mm) duct opening. Use it when a duct resize or drywall job leaves a hole that no store-bought cover fits. It has a 132 mm square face, a 98 mm locating skirt that leaves 1.8 mm of play per side, 3.5 mm straight-through slots stiffened by 9 mm deep vanes, and two countersunk 4.6 mm holes for #8 wood screws (4.2 mm shank) or M4 screws. Change OPEN_W and OPEN_L at the top of the script to fit other opening sizes.
Register Vent Air Deflector Clamp
A 150 mm wide, 50°-angled deflector blade that screw-clamps onto the outermost louver fin of a floor, wall or ceiling HVAC register to throw supply air away from curtains, a bed or a sofa instead of straight up the wall. Two clamp posts take an M4 heat-set insert (5.5 mm bore) and an M4 set screw that pins any fin up to 12 mm thick against an 8 mm anvil, so it works on stamped steel and moulded plastic registers alike — unlike magnetic deflectors that slide off. Blade is 2.6 mm thick with three full-length stiffening fences; overall 150 x 69 x 66 mm, prints rail-down with no supports.
Bath Fan Outlet To 4 in Duct Adapter
A transition that bolts over the flat oval/rectangular side-discharge outlet of an old bathroom exhaust fan housing and converts it to a plain 4 in round duct collar, so a modern flex duct clamps straight on. The 150 x 94 mm mounting flange carries a 110 x 56 mm port opening, four 4.5 mm M4/#8 screw holes at ±64 x ±34 mm plus two 14 mm adjustment slots, and the collar is Ø100.5 mm x 22 mm tall with a 45° retaining bead; overall height 70 mm.