Neiko Battery Cover

The cover, outer face up: a pale rounded rectangle 2.47 mm thick, its near end sloped at 45° and a groove along each side under the rim. — Version 8, outer face up. The sloped end is the one left showing on the caliper.

Download

Battery cover STL
Version 8, 253 KB. Prints flat in 8 min, with 0.5 g of PLA and no supports.

Times are Bambu Studio's, for a Bambu Lab A1 mini with a 0.4 mm nozzle and 0.20 mm layers.

What it fixes

The battery in this caliper sits under a small cover. The cover slides in on two rails, and two small bumps keep it from sliding back out. Ours fell off anyway, and Neiko does not sell the cover on its own.

Neiko has since changed the caliper: the one sold now holds its cover with a screw. This cover is for the older ones, which have no screw.

How it fits

The cover upside down, as it prints: a curved channel across most of its underside, open at the near edge, a round seat in each far corner, and a groove along each side under the rim. — The underside, as it sits on the print bed. The channel clears the battery, and the seats take the bumps.

The caliper's opening measures 16.99 × 14.06 mm. The cover is 16.69 × 13.76 mm, 0.15 mm clear of it on each side, and 2.47 mm thick.
A groove along each side, 0.45 mm deep, takes a rail. The cover slides in toward the display, and a shallower groove at its leading end takes the smaller lip there.
The battery is 11.52 mm across and stands 1.27 mm above the floor of the compartment. A channel 11.92 mm wide and 1.47 mm deep lets the cover pass over it.
Two round seats, 2.02 mm across and 0.40 mm deep, sit over the compartment's two bumps, which measure 1.82 mm.
The end left showing is sloped at 45°, 1 mm deep, and the slope eases to 0.3 mm at the corners so the grooves stay whole.

How it got here

We measured the opening, its lip, the bumps and the battery before modelling anything, then drew the cover in Blender from those numbers. There are eight versions, and each one changed a single thing.

Three covers upside down, left to right: a plain hollow lid; the same lid with a raised pad in two corners, each with a round seat; and the final cover, solid, with a curved channel and two round seats. — Versions 1, 3 and 8, from underneath.

Version 1 was a plain lid, sized from the opening. Version 2 added the grooves, so the cover slides on instead of pressing in. Version 3 added the seats for the bumps, on pads raised inside the lid, and version 4 opened the channel, because the battery ran into those pads.

The pads stood over empty space as the cover printed, so they needed supports. Version 5 filled the underside solid around the channel and kept every overhang to 45°, so it prints with none. It was the first one we printed, and it nearly fit: the grooves had a little play, and a small gap showed until we pressed the cover down. Version 6 raised the lower face of each groove by 0.15 mm to take up the play.

Two covers outer face up, their exposed ends toward us: in front, version 7, whose end looks almost square; behind, version 8, with a broad slope across its end. — Version 7's 0.3 mm slope, in front, and version 8's 1 mm slope, behind.

Version 7 sloped the exposed end at 45°, 0.3 mm deep. That was too small to see, in the slicer or on the print. Version 8 made the slope 1 mm and kept it small at the corners, clear of the grooves. Version 8 fits, and it is the file here.

Print it

Print it at 100 %, outer face down, the way it opens in the slicer. Every overhang is 45° or less, so it needs no supports.
Slide it on toward the display with its grooves on the rails, until it sits flush over the bumps.
We printed ours in PLA.

Before you print

It is fitted to our caliper, an older Neiko whose battery cover has no screw. Measure your opening first: ours is 16.99 × 14.06 mm. If yours matches, trying the cover costs eight minutes of printing.

Version 8, 15 September 2026