From the Loftsmith Workshop

Floor vent extender for under sofas, sized to your register

Keeps warm or cool air from dying behind the sofa. It sends the flow out along the floor under the furniture, with fine slots across the top so the air can spill out. Change how far it reaches and the gap under your sofa to fit your room.

10 parts · 545 g · 301 × 332 × 44 mm

by Loftsmith Workshop

Low flat slotted panel in two tones, made of joined sections with a groove down the middle
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No adjustable sizes

Ask for the sizes you want to tweak, e.g. “make the width adjustable”.

Change it in the Studio

Parts

  • hood-left · PETG · Roof down on the bed, open side up; no supports

    153.5 x 167.2 x 44 mm, about 82 g, 112 min. Slate. Covers the left half of the grille; its outer wall and back wall surround the grille edge. Its back ramps up to the roof to turn the rising air forward.

  • hood-right · PETG · Roof down on the bed, open side up; no supports

    150.5 x 167.2 x 44 mm, about 82 g, 113 min. Slate. Mirror of the left hood, with the dovetail slots on its seam wall.

  • section-left ×2 · PETG · Roof down on the bed; no supports

    153.5 x 164.7 x 44 mm, about 78 g and 107 min each. Steel blue. The reach slider sets how many are needed and their exact length.

  • section-right ×2 · PETG · Roof down on the bed; no supports

    150.5 x 164.7 x 44 mm, about 78 g and 107 min each. Steel blue.

  • coupler-left ×2 · PETG · Roof down on the bed; no supports

    147.3 x 40 x 41.6 mm, about 17 g and 30 min each. An inner sleeve that joins hood to section and section to section; a rounded ridge on its seam-side wall clicks into a window in the seam wall.

  • coupler-right ×2 · PETG · Roof down on the bed; no supports

    147.3 x 40 x 41.6 mm, about 17 g and 30 min each.

Print settings

Layer height
0.2 mm
Walls
2 walls: about 565 g and 13 h 21 min for all 10 parts
Infill
15%
Supports
None. Every chamfer and the hood ramp is about 39 degrees from vertical when printed roof down; the roof flutes have chamfered sides.
Notes
PETG, because the air from a supply register is warm and PLA softens at around 55 °C. Every part prints roof down, so the fluted, bed-smooth face ends up on top. At the defaults every part fits a 180 mm bed (the largest is the 153.5 x 167.2 mm hood). Suggested colours: slate for the two hoods, steel

Assembly

  1. Measure the duct size (the nominal size, e.g. 4x10), how far the grille plate reaches past the hole on each side, how high the grille stands above the floor including any damper lever, and the gap under the furniture with the furniture in place. Set the sliders to match.
  2. Print one coupler and one section first and push them together. If the fit is too tight or too loose, change the Coupler slide clearance slider and reprint.
  3. Build each lane on its own. Push a coupler halfway into the front of the hood until its ridge clicks into the round window in the seam wall, then push a section onto the coupler's other half. Repeat for every section.
  4. Set the left lane over the grille so its outer wall and back wall surround the grille plate and its seam wall straddles the grille.
  5. Lower the right lane straight down beside it so the dovetail keys on the left lane's seam wall slide into the slots on the right lane. The two lanes then move as one, with the roof flutes pointing the way the air flows.
  6. To vacuum underneath, lift the right lane straight up first, then the left.

Good to know

  • Only for heating supply registers in living spaces. Never use it on return grilles, appliance vents, or combustion-air or dryer vents.
  • The airflow claim is only the computed area: 43% of the duct opening at the defaults. The 25%-or-more check was rebuilt at each slider's ends with the other sliders at their defaults (26% at the 34 mm minimum gap), not at every combination. A low gap combined with a 4x14 register may come close to o
  • Not for standing on. The 2 mm roof spans about 145 mm per lane, and no load check was made, so keep feet and pets off any part sticking out into the room.
  • The hood stays in place only because its walls surround the grille's raised edge; there are no magnets. On a grille only 3 mm tall the hold is shallow.
  • Only 2 in and 4 in deep registers (2x10 to 4x14) are offered. Wide grille rims make the hood longer than 180 mm, so those need a 256 mm bed. 12 in and 14 in registers split into three lanes.
  • Grams and print time rise roughly in proportion to the reach.
  • The fits (couplers, detent ridges, dovetails) were checked as geometry in the Loftsmith engine, not printed. Print one coupler and one section first to test the fit.
  • On deep carpet some air escapes under the open-bottomed channel walls.
I printed this Remix

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