Enclosure temperature rise
Quick answer
A 220 by 220 mm heated bed in a typical uninsulated enclosure of about 0.5 cubic metres lifts the chamber roughly 17 C above room temperature, which is usually enough for ASA but marginal for large ABS parts.
A simple heat balance with assumed loss coefficients. Real enclosures vary enormously with leakage and insulation, so treat this as a planning estimate and measure the real chamber with a thermometer.
This is an estimate from a simple heat balance, not a specification. A thermometer inside the real chamber is worth more than any calculation.
Below about 35 C the chamber is doing little for ABS or polycarbonate. Large ABS parts usually want 45 C or more to stop corners lifting, so consider insulating the walls or fitting a larger bed.
Enclosures and enclosed printers
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YOOPAI Multifunctional Resin 3D Printer Enclosure with Ventilation Filter
$53.99 Check pricePrices change often - DORUNDEA
Multifunctional 3D Printer Enclosure Ventilation Eliminate Odors Tent Cover
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YOOPAI Large Resin 3D Printer Enclosure with Ventilation Kit & LED Light
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Creality Ender 3 V3 SE Beginner-Friendly 3D Printer with Auto Leveling
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Safety
Common questions
How hot does a 3D printer enclosure get?
A passive enclosure heated only by the bed typically runs 10 to 25 C above room temperature, depending on bed size, enclosure volume and how well sealed it is. That is enough for ASA and small ABS parts but usually short of the 45 to 60 C that large ABS or polycarbonate parts want, which is why heated chambers exist as a separate feature.
Do I need an enclosure for PLA?
No, and it can actively hurt. PLA prints best with strong part cooling and a cool ambient, and a hot chamber softens the part as it prints, which causes drooping overhangs and poor bridging. If you have an enclosure and print mostly PLA, leave the door open.
Will insulating the enclosure help?
It roughly doubles the temperature rise for the same bed, because it halves the rate at which heat escapes through the walls. It is the cheapest way to lift a marginal chamber into ABS territory. Keep insulation away from the power supply and the control board, both of which need their own airflow.
Can I put the electronics inside the enclosure?
It is a poor idea above about 40 C. Stepper drivers, the power supply and the mainboard all rely on ambient air to shed heat, and a warm chamber raises their operating temperature and shortens their life. Most enclosed machines mount the electronics in a separate compartment with its own fan for exactly this reason.