VentForge is a customizer for printable vent grilles, vent covers, wall inserts, inspection covers, mesh inserts, and experimental backdraft shutter fronts.
It is useful when a ready-made store grille does not fit your wall opening, duct, workshop vent, cabinet vent, utility room, garage, shed, or custom project.
Boost MeIf VentForge helped you make a custom vent grille that actually fits your wall opening, a Boost would really help this generator reach more makers and support future improvements.Backdraft shutter front
✨ What It Makes
🌧️ Rain louver vent grilles
🕸️ Printed insect mesh inserts
🔲 Solid slicer-infill mesh plates
🧰 Inspection / access covers
↩️ Experimental backdraft shutter fronts
🧱 Wall inserts for rectangular or round openings
🔩 Screw-mounted or glue-mounted variants
⚙️ Main Customization
Rectangular or round wall opening
Standard size presets for common ducts and masonry shafts
Functional presets for grille, mesh, cover, shutter, glue mount, and airflow tests
Frame shapes: rectangle, oval, circle, hexagon, octagon, and flower
Sharp, rounded, or chamfered rectangle corners
Optional custom outside front size or custom left/right/top/bottom front margins
Asymmetric front margins for custom cover shapes. Best with rectangle, oval, hexagon, and octagon; always check the preview before printing.
Screw holes from 2 to 8, with adjustable position
Louver angle, spacing, count, thickness, and depth
Printed mesh patterns: square, diamond, slits, crosshatch, or solid
Separate preview / 3MF colors for base, front, mesh, and clamp
Normal print layout, exploded assembly preview, or single-part output
🚀 Quick Start
Measure the real wall opening.
Choose a Size Preset or enter your own dimensions.
Choose a Function Preset:
Rain louver
Printed mesh
Slicer-infill mesh
Inspection cover
Backdraft shutter
Airflow-compensated louver
Glue mount
Generate, slice, and test fit before printing a large final part.
Presets are starting points. You can keep the preset and disable selected override groups if you want to fine-tune only one part of the design.
🧪 Experimental Features
Some features are intentionally marked experimental:
Backdraft shutter front - separate moving blades pressed into the front frame.
Experimental center-side shutter hinge - optional alternative hinge position for the moving shutter blades.
Airflow compensation - enlarges the front grille area when louvers or mesh reduce open area.
Real mosquito mesh holder - for testing a clamped piece of real mesh.
Asymmetric margins on non-rectangular frames - useful for custom covers, but oval, hexagon, and octagon can render differently than a rectangular frame. Circle and flower stay radial, so margins mainly change overall size.
These modes are useful, but fit and movement depend on printer calibration, material, layer height, and selected clearances. Test small before printing large.
🖨️ Print Notes
The default output places parts flat on the bed. Assembly preview keeps the mounted orientation so you can inspect how the parts stack together.
For the printed mesh, the Solid pattern creates a thin plate that can be turned into a slicer-generated mesh by using sparse infill and disabling top and bottom shells.
If the fit is too tight, increase the clearance values before printing a full-size vent.
🌍 Language Versions
The generator includes EN, PL, and DE SCAD versions.
If you print it, feedback is welcome. I am especially interested in real fit results, unusual duct sizes, mesh tests, backdraft shutter behavior, and airflow-compensation tests.
Changelog
2.1.0 - 2026-07-05
Added custom visible front sizing for covers that should not directly follow the wall opening size.
Added custom outer front width/height mode.
Added independent left/right/top/bottom front margin mode.
Improved screw-hole placement for asymmetric custom front margins.
Custom front margins also work with oval, hexagon, and octagon frame shapes, but check the preview before printing because non-rectangular shapes can render differently.
Circle and flower frames remain radial shapes, so custom margins mostly affect overall size rather than independent sides.
Added an experimental center-side hinge position for backdraft shutter blades.
Reduced default backdraft shutter side clearance to 1.0 mm.
2.0.0 - 2026-07-02
Added standard size presets for round ducts, flat plastic ducts, and masonry shaft openings.
Added functional presets, so size and vent type can be selected separately.
Added ready-to-use modes for rain louvers, printed mesh, slicer-infill mesh, inspection covers, experimental backdraft shutters, airflow-compensated louvers, glue-mounted louvers, and real mesh holder tests.
Added preset override switches for manual fine-tuning.
Added experimental airflow compensation.
Added experimental backdraft shutter front.
Added solid inspection/access cover mode.
Improved screw-hole placement, round-opening behavior, part fit, and UI organization.
Increased maximum opening dimensions to 500 mm.
1.0.1 - 2026-06-23
Added a Solid printed mesh pattern for slicer-generated mesh using sparse infill and disabled top/bottom shells.
Rasvodin
