Custom TPU Feet to Stop Furniture from Sliding

Why felt pads keep failing

Felt pads have two jobs: protect the floor and stay attached. They do the first one for about 60–90 days before the adhesive gives up. Hair, dust, and grit accumulate on the adhesive layer until the pad falls off and gets stuck to someone's sock. Then you're back to bare chair legs scratching the hardwood.

Felt also doesn't prevent sliding. Its coefficient of friction on hardwood is low enough that chairs drift whenever someone sits down or stands up. That's fine on carpet. On hardwood, tile, or laminate, it means your dining set rearranges itself during every meal.

TPU solves both problems. It grips hard floors with a coefficient of friction of 0.70–0.90 (2–3x that of felt or plastic glides), it never falls off because it's mechanically fitted to the leg, and it doesn't wear out for years. I put TPU feet on my dining chairs 18 months ago. They look the same as the day I installed them.

The friction coefficient advantage

Softer TPU (lower Shore number) grips more because the material conforms to micro-irregularities in the floor surface. 85A deforms enough to create almost suction-like contact. The tradeoff: 85A wears faster than 95A under daily chair-sliding use. For dining chairs that get dragged across the floor constantly, TPU 95A balances grip with durability. For heavy furniture that sits in one place (bookshelves, side tables), 85A gives maximum grip. Siraya Tech's shore hardness comparison has a visual guide to how different hardness grades feel and flex.

Measuring your chair legs

Flip the chair upside down and grab calipers. Measure the leg cross-section at the bottom. Common sizes:

For cap-style feet (the most common design), add 0.2–0.4mm clearance to the leg measurement. The foot should push on snugly without excessive force. TPU's flexibility is forgiving here. I've had feet with 0.5mm of clearance that still hold perfectly because the material grips the leg.

If you can't easily flip heavy furniture, use the paper template method: press a piece of paper against the leg bottom, trace the outline with a pencil, then measure the tracing. Not as precise as calipers, but close enough for TPU's flexible tolerance.

Design styles

Cap style (friction fit)

A cup that slides over the leg end. This is what I use on everything. The TPU wall stretches slightly during installation and then grips the leg. Stays put through daily use without adhesive. For tapered legs, match the inner profile to the taper angle. A straight cup on a tapered leg will rock.

Cup style (gravity-held)

An open cup the leg sits into. Works well for heavy furniture where gravity does the holding. The leg doesn't need to fit perfectly because the weight keeps it seated. Easier to remove for cleaning. Less secure for light chairs that get picked up and moved.

Adhesive-backed pad

A flat disc printed in TPU, attached with double-sided tape or contact adhesive. Simplest to design and print, but relies on the adhesive bond. Better than commercial felt pads because the TPU is thicker and the adhesive area is larger, but eventually the adhesive weakens. I'd only use this for legs where a cap won't work (odd shapes, very wide legs).

For design ideas on functional print fit and tolerances, the replacement knob guide covers the same friction-fit principles with detailed clearance values. And for broader furniture printing projects, the furniture printing overview has more ideas.

Print settings for TPU feet

• Layer height: 0.2mm for the body, but the grip surface (the part that contacts the floor) matters most.
• Bottom layers: 5–8 solid layers. This is the contact surface. More solid layers = smoother, more consistent grip.
• Infill: 30–50%. Concentric pattern works well because the load distributes evenly.
• Speed: 30–50 mm/s for 95A, 15–25 mm/s for 85A.
• Temperature: 220–240°C nozzle, 50–60°C bed.
• Retraction: 0.5–1.5mm, 15 mm/s. Minimal retraction prevents jams.

Print the foot with the grip surface on the build plate. The first-layer contact with the build plate produces the smoothest possible surface, which is exactly what you want touching your floor. The inside of the cap (which contacts the chair leg) can have layer lines; those actually help grip the leg.

The Q2 handles TPU 95A well at $499. Direct drive extruder, heated chamber for consistent temperature. For more functional print ideas using TPU, plenty of household projects benefit from the same material.

Parametric models worth downloading

Don't model from scratch unless your legs are an unusual shape. These parametric designs let you input your leg dimensions and generate a custom foot:

• Chair Leg Pads Collection by Lucandia (Printables) — parametric round and square, 5–50mm range.
• Table Leg Foot Generator by SteveS42 (Printables) — OpenSCAD with customizer sliders.
• Parametric Chair Foot by buteomont (Thingiverse) — default 22.2mm, adjustable via customizer.

Print a test foot before making a full set. I print one, test-fit it, adjust if needed, then print the remaining batch once I'm happy with the fit. A set of four feet for a single chair uses about 20–30g of TPU ($0.50–0.75 in filament). A dining set of six chairs costs about $3–4.50 total. Commercial TPU furniture feet run $2–5 per chair in the sizes I need.

For more TPU project ideas, the phone case guide uses the same material with tighter tolerances. And the cosplay armor guide takes TPU to the opposite extreme in size and complexity. Browse the common filaments collection for TPU options.