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21700 Power Bank STL Models for DIY Builds

This collection gathers 3D-printable parts for building a power bank around 21700 lithium-ion cells. It covers outer cases, cell holders, module mounts and small magnetic bodies, so you can match a design to the electronics you already have. Files are meant for a 3D printer, and most are split into several parts to fit a normal build volume. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

O texto desta coleção está em inglês; a busca funciona em qualquer idioma.

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O Polyzon monta esta coleção a partir dos resultados de busca dos sites conectados. Repetições e modelos sem prévia são removidos, correspondências fracas vão para o final e o restante segue a ordem da busca. Os modelos pertencem aos seus autores — confira os termos na página de cada modelo.

Regras de seleção: equipe editorial do Polyzon · Texto atualizado em 10/10/2026

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«21700 Power Bank STL Models for DIY Builds»

The designs differ mainly in how many cells they hold and how the cells are wired. Some are single-shell cases for one or two cells, others are trays and frames for parallel or series packs where the cells sit side by side. There are also open frames that hold a ready-made module rather than a bare board, and small magnetic bodies that clip together without screws.

When choosing a model, look at the cell count and the pack layout the author describes, then compare it with the module you plan to use. Check the wall thickness around the cell slots, how the lid or latch closes, and whether the author lists supports, material and print orientation. On the author's page you can usually find the inner dimensions, the number of parts and photos of real prints, which help you judge whether the wiring and the connector cutouts will line up.

To narrow the results, search for the cell format together with the part you need, such as a case, holder, cap or module mount. Related terms include cell spacer, battery tray, 18650 holder and power bank shell, and you can also look at USB-C breakout housings or battery pack enclosures. Combining a capacity or output figure with the layout, for example a four-cell pack or a series build, usually brings up a smaller and more relevant set.

FAQ

Perguntas frequentes

What do I need to check before printing a 21700 power bank case?
Compare the inner dimensions with your cells and module, and note the number of parts and how they join. The author's page usually states the material, layer height and whether supports are needed.
Can the same case take 18650 cells instead of 21700?
Only if the model is drawn for both formats or includes adapters. Cell diameter and length differ, so check the slot dimensions before printing.
How are these power bank models usually assembled?
Most are printed as a shell plus a lid, with slots for the cells and cutouts for the connector. Some designs use screws or magnets, others snap together, and the author's description explains the intended order.
Which search terms help find more designs like these?
Try cell holder, battery tray, power bank shell, module mount or pack enclosure, and add the layout such as parallel or series. Adding the connector type also narrows the list.
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