This is an affordable device to test trigger weight settings of a firearm. It uses a soda bottle as the weight. I have printed this using PLA it takes approximately 2h to print. Once complete you need to assemble as pictured using the printed pins. Some parts are tight fitting so check the finish quality around the joins. The total print assembled with a 1.25lt soda bottle should weight around 90g. Add water (1mL = 1 g) to the soda bottle to reach your desired weight and test your trigger.  In use the support arms flex quite a bit due to the weight offset however if used carefully will function as desired and I have found it to be fairly accurate. Enjoy!