3x AAA Dummy Battery for SainSmart vacuum pump

I was sick of the lackluster battery-powered performance of my SainSmart vacuum pump that I use for my filament vacuum bags so I modeled this up. It replaces the three AAA batteries allowing you to run it from a 5V supply or benchtop PSU.

You'll need 2x M4 bolts and nuts and wiring. You'll need to remove the two battery jumpers as shown in the images, they slide right out easily. Clamp the wiring between the nut and head of the bolt then pass it through the center hole.

Thread the bolts through the appropriate holes (I tapped them with an M4 tap after printing) and adjust so the dummy battery fits and makes proper contact. The original battery cover also fits back on so you can drill a hole in that as well if you wish.

This may fit other 5V pumps that are similar in construction. The pumps is much stronger running on 5V than the original 4.5V from the batteries.

I've included a STEP file as well as the STL and original Inventor IPT file so you can modify this as needed for your application.

Only takes about 25 minutes to print, printed on my modified Ender 3 V2 with Revo Hemera XS and Klipper. Place the flat side on the bed as shown. I used a 0.4mm nozzle and I used 50% variable layer height in Prusa Slicer with a 0.2mm base height.