Best filament for functional homelab parts: PLA vs PETG vs ASA vs TPU

A cable clip and an outdoor radio case have very different jobs. Buy the spool for the part, not the colour of the rack. PETG is the useful starting point for everyday mounts, PLA makes tidy cool-room panels and prototypes, ASA handles exposed outdoor parts, and TPU gives you feet that bend instead of brackets that sag.

Material facts from maker datasheets, checked October 30, 2026.

Quick picks: four spools, four jobs

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• Everyday mounts: Polymaker PETG Black, 1.75 mm / 1 kg. Start here for Pi cradles, light SSD mounts and cable clips.
• Cool indoor parts: Panchroma Basic PLA Black, 1.75 mm / 1 kg. Choose it for blanking panels, label holders and checking a bracket’s shape before the final material.
• Sun and warmer jobs: Polymaker ASA Black PF01001, 1.75 mm / 1 kg. Choose it for exposed radio mounts and outdoor cases, with an enclosed printer and ventilation.
• Flexible contact parts: PolyFlex TPU95 Black PD01001, 1.75 mm / 0.75 kg. Use it for feet, bumpers and soft cable-contact pieces.

If you’re still choosing the machine, our 3D printer picks for a homelab tinkerer separate open-frame PLA/PETG projects from enclosed ASA work. The 3D printing hub brings the materials, machines and projects together.

What are you making?

Part	Start with	Why it fits
Cool indoor blanking panel or label holder	PLA	A rigid, tidy part with an easy first printing workflow
Pi cradle or light SSD mount	PETG	A practical mechanical-part material; leave vents and connector access open
Light rack ears/brackets near warm gear	PETG, or ASA when the temperature calls for it	Choose around the part’s actual heat and load; use metal for heavy equipment
Outdoor Meshtastic case or exposed mount	ASA	Maker-stated UV and weather resistance
Cable comb or clip	PETG	A useful mechanical fit for holders and clamps
Feet, bumpers or a soft cable-contact insert	TPU95	Flexibility is the point; it isn’t a rigid shelf material

Our printed homelab parts guide covers panels, shelves and fasteners. Keep the structural rack and shelves under a heavy NAS or UPS metal; save the printer for the organizers, adapters and light-duty parts around them.

Read the heat numbers before picking the bracket

HDT, Tg and Vicat are different tests. HDT measures deflection under the stated test load; Tg describes a material transition; Vicat measures softening under a specified penetration test. Use them to compare the documented materials, then leave temperature margin for a loaded part.

These are the current maker sheets linked from the product pages, not generic numbers for every spool bearing the same plastic name.

Selected material and TDS	Glass transition, Tg	HDT at 0.45 MPa	HDT at 1.8 MPa	Other published property
Panchroma Basic PLA, V2.1	Not listed	Not listed	Not listed	Vicat 62°C, ISO 306
Polymaker PETG, V3.0	71.24°C	69°C	65°C	Vicat 75°C
Polymaker ASA, V6.0	98°C	103°C	100°C	Vicat 105°C; UV resistance stated
PolyFlex TPU95, V5.4	Not listed	Not listed	Not listed	Shore hardness 95A

PETG and ASA HDT values use ISO 75; their Tg values use DSC at 10°C/min. The TPU hardness test is ISO 7619-1 / GB/T 531.1. The selected sheets publish no numeric UV exposure-life rating, so the outdoor choice rests on ASA’s stated UV/weather resistance, not an invented number of sunny years.

Don’t turn the PLA’s 62°C Vicat value into a Tg or HDT number. It’s a different column for a reason. Likewise, keep PETG’s two HDT loads separate: a number at 0.45 MPa doesn’t describe the 1.8 MPa test.

PLA: the tidy indoor starting point

PLA is a good way to turn a sketch into a part you can hold. Use Panchroma Basic for a cool indoor label holder, blanking panel or first-fit prototype. Check that the screw holes line up and that the cable actually clears the lid before spending time on the final version.

For a bracket close to a warm exhaust, move the material decision ahead of the colour decision. Start with PETG or ASA according to the heat and load, and keep a rigid PLA mock-up as the fit reference. The maker’s Basic datasheet is the source for this spool; a different PLA blend can have different properties.

PETG: buy this for the everyday mount

A Pi cradle, a light SSD bracket and a row of cable clips are the kind of useful jobs that make PETG worth keeping on the shelf. Prusa’s PETG guidance names mechanical parts, holders and clamps as typical uses. Polymaker’s current PETG sheet says an enclosure isn’t needed.

Build the mount around the hardware’s airflow. Leave the Pi’s cooler inlet open, give the SSD room to shed heat and place a cable exit where it won’t pull on a connector. A case that looks beautifully solid in the slicer still needs holes in the right places.

The PETG table above is for Polymaker PETG V3.0, not the older PolyLite PETG formulation. Use the matching profile for the spool. For vent patterns and fasteners, follow the printed-parts guide instead of filling every opening with plastic.

ASA: take the project outside

Choose ASA for the exposed parts of an outdoor Meshtastic build: a shaded mounting bracket, an antenna support or a case designed for the board and battery. Its maker sheet explicitly describes improved weather resistance and UV resistance, alongside the higher heat-deflection figures in the table.

An outdoor case also needs a plan for water, seals and cable exits. Our 3D-printed Meshtastic case guide keeps the solar relay in a commercial IP-rated box and puts the printed tray inside. That’s a useful split: buy the weather shell and print the internal fit.

ASA needs an enclosure and ventilation. ABS belongs in that setup discussion too. Our printer enclosure, fumes and power guide covers where the printer goes and how to handle the air. Pick an enclosed machine for this job; don’t enclose an A1 to make it an ASA printer.

TPU: make the bit that should bend

Feet and bumpers have a different brief from a shelf: you want compliance at the contact point. PolyFlex TPU95 is the flexible pick here, with a maker-published Shore hardness of 95A. Print the soft insert separately and let a rigid PETG or ASA part carry the shape around it.

Polymaker recommends a direct-drive extruder, with the drive close to the hotend. A long unsupported feed path makes soft filament harder to handle. Start with the maker’s profile and a small foot or bumper rather than a whole plate of elaborate supports.

What the spool needs from the printer

Plain material and a fibre-filled blend are different purchases. The four picks here are unfilled. Don’t add a hardened nozzle to every shopping list simply because the label says ASA or PETG.

For a specific example, Polymaker’s Fiberon ASA-CF08 datasheet recommends a wear-resistant nozzle, such as hardened steel or ruby, because the blend abrades brass. That instruction belongs to that CF blend, not automatically to the plain ASA spool above.

Then deal with moisture. Keep open rolls protected, use the exact filament maker’s drying instructions and feed moisture-sensitive material from dry storage where appropriate. Our filament drying and storage guide separates a heated dryer from a storage-only box, so you buy the tool that solves the problem. Polymaker specifically recommends dry storage for its PETG; give flexible TPU the same attention before chasing settings.

From spool to a useful part

1. Name the job. Is this a panel, a light mount, an outdoor shell or a flexible contact piece?
2. Choose the material around heat and sunlight. Use the specific TDS, not a generic melting-point chart.
3. Design the fit. Keep airflow, plug access, screw clearance and antenna exits in the model.
4. Print a small fit piece first. A corner with the mounting holes can settle the dimensions before a full enclosure.
5. Try it where it will live. Inspect the part under its real load after the equipment warms up; change a softening or deforming part before relying on it.

Start with PETG for most useful mounts. Keep PLA for cool indoor parts, ASA for exposed outdoor work and TPU for the pieces that should flex. A spool chosen for the job is more useful than four impressive material names on the shelf.