Enclosures for power banks, UPS units and batteries

Which power enclosures we print

• Power banks on 18650 and 21700 cells — with cut-outs for USB-C, USB-A, a button and a charge indicator, and cradles so the cells don’t move inside.
• UPS units for a router, ONU or Starlink terminal — an enclosure for the cells, a BMS board and a 12 V boost converter, with DC jacks and a switch.
• Enclosures and covers for power supplies — like the Mean Well LRS-350 order below: two halves and a cable insert, so the terminals aren’t left exposed.
• Boxes for LiFePO4 packs and e-bike or power tool batteries — if the pack fits the 256 × 256 × 256 mm build volume or the model is split into parts.
• Cell holders, dividers and board mounts inside ready-made enclosures.

A ready-made enclosure for a router UPS with 3 or 6 21700 cells is the 21700 mini UPS enclosure. Enclosures for other devices are on the enclosure 3D printing page.

LiFePO4 packs for an inverter

If you are building a 12–48 V battery from 280–320 Ah prismatic cells (EVE LF280K, LF304, MB31), we have ready-made parts at fixed prices: LiFePO4 terminal covers — “+” and “−” caps, busbar covers numbered by balance wire, cell spacers and a BMS shelf. For the 18650 and 21700 cells used in power banks, there are boxes and cases where the cells never touch each other.

We print a box for the pack itself from your model if it fits within 256 × 256 × 256 mm or is split into parts. PETG covers and enclosures insulate against an accidental touch, but not against heat or a short circuit: a fuse and a BMS are mandatory.

Why PETG for power enclosures

The charging board, the converter and the cells themselves get warm, and a power bank often sits in a car or on a windowsill. PETG holds its shape up to about 70 °C, isn’t afraid of moisture or knocks and doesn’t crack over time. We don’t recommend PLA for these enclosures: it softens from 55–60 °C.

We print walls with at least three perimeters, so the enclosure doesn’t crack under a self-tapping screw and standoffs and latches keep their shape. Vent slots, holes and cradles come out exactly as in your model: our Bambu Lab A1 holds accuracy to ±0.2 mm.

What to allow for in the model

• Cell clearance: for 18650 — a hole or cradle of Ø18.8–19 mm, for 21700 — Ø21.6–22 mm; cells from different makers differ slightly in diameter.
• Ventilation near the charging board and converter — under load they get hotter than the cells themselves.
• The enclosure protects against knocks, dust and accidental contact, but it doesn’t replace a BMS and a fuse: battery protection has to be on the board.
• Split packs larger than 256 mm into parts with screw joints — that way they fit on the print bed.

Wall thickness, ventilation, snap-fits and FDM tolerances are covered in the guide how to design an electronics enclosure for 3D printing.

How to order

Send your model in STL, OBJ, STEP or 3MF format through the request form or a messenger and tell us the colour you want — we’ll quote the price and lead time within an hour. We print from your ready-made model. No file? We’ll tell you where to find a ready-made model (Printables, Thingiverse, MakerWorld) or model it ourselves from a drawing or exact dimensions; modelling is charged separately.

The minimum order is 250 UAH. We print several identical enclosures together on one bed, so each one costs less than printing them one by one. We ship finished parts by Nova Poshta anywhere in Ukraine on the day printing is finished. More about rates on the 3D printing prices page.