I built this timer for our specific purposes, but thought I would put the files up for anyone who wants them. This is by no means a complete project and will take some creativity and tinkering to make it work.

The timer is for a 4 lane BestTrack derby track. This project is based off  https://dfgtec.com/, but https://billvsderbytimers.weebly.com/minimal-hw-designs.html would also work. All expenses were spared on this project, so things like digital displays were not used to save money (a display using DerbyNet on a laptop was used to display race results onto a large TV screen).

A few notes about the design. Initially the track was going to be an open top design, so the electronics would be exposed. It was decided later that a lid was needed, so things like the status light, and reset switches needed to relocated to be accessible from the outside. Rather than reprinting, holes were drilled for routing cables to the outside, the status light, and reset switches. The lid was drilled for screw holes and the lid supports were glued into place.

Unless you have a large volume printer, you'll probably need to split the rather large model into smaller parts and glue it together. I used Orca slicer to split the model and create dovetails for gluing the model together.

There is a plate provided for Wago lever locks for making electrical connections.

These are the switches I used for the start gate and reset buttons, there are brackets included in the files.

https://www.amazon.com/WWZMDiB-Micro-Switch-V-15-Suite/dp/B09YXZGDVC/ref=sr_1_3?crid=1EPHURN9MMYSZ&dib=eyJ2IjoiMSJ9.gIMEnlw0m-Tracm7LGldZUDFHNXUN7I80p0vI85X96x48p7onsgqpVIdeFXdc_s3Tdg4RooymBdhsYiI1tIsYOYsxlFIHCvzrt98W0ZO_VxnKveAygJIoVQQXx357UgUnyHOOSvkjMXtJ8Vyb75SI8gKVKj3e_B6GXRe4tClk8EAQPnOk8mhnK_1syectsSqMUhgINVRn7rKEqK-SCWJktEhZTB2xz82-FxxqcRre0g.4DLYpPT3v_4xv0QOau7Fzy3eLEPcskTpCxz_N4YTJNg&dib_tag=se&keywords=micro%2Bswitches&qid=1772254272&sprefix=micro%2Bswitches%2Caps%2C150&sr=8-3&th=1

Good Luck!